FILE - This March 20, 2018, file photo shows the YouTube app on an iPad in Baltimore. In a formal complaint being filed Monday, April 9, child advocates and consumer groups are asking the Federal Trade Commission to investigate and impose potentially billions of dollars of penalties on Google for allegedly violating children’s online privacy and allowing ads to target them. (AP Photo/Patrick Semansky, File)

FILE - This March 20, 2018, file photo shows the YouTube app on an iPad in Baltimore. In a formal complaint being filed Monday, April 9, child advocates and consumer groups are asking the Federal Trade Commission to investigate and impose potentially billions of dollars of penalties on Google for allegedly violating children’s online privacy and allowing ads to target them. (AP Photo/Patrick Semansky, File)

The fine print of YouTube’s terms of service has a warning that goes unheeded by millions of children who visit YouTube to watch cartoons, nursery rhymes, science experiments or videos of toys being unboxed.

“If you are under 13 years of age, then please do not use the service,” the terms say. “There are lots of other great web sites for you.”

In a complaint filed Monday, child advocates and consumer groups are asking the Federal Trade Commission to investigate and impose potentially billions of dollars of penalties on Google for allegedly violating children’s online privacy and allowing ads to target them.

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“Google profits handsomely from selling advertising to kid-directed programs that it packages,” said Jeff Chester, director of the Center for Digital Democracy, one of the groups that drafted the complaint. “They created a successful model monetizing kids’ data.”

Television networks also run ads during cartoons and other programs aimed at kids.

The difference? YouTube does so with a lot of data collection. Its business model relies on tracking IP addresses, search history, device identifiers, location and other personal data about its users so that it can gauge their interests and tailor advertising to them. But a 1998 federal law prohibits internet companies from knowingly collecting personal data from kids under 13 without their parents’ consent.

The coalition accuses YouTube of violating that law and deliberately profiting off luring children into what Chester calls an “ad-filled digital playground” where commercials for toys, theme parks or sneakers can surface alongside kid-oriented videos.

YouTube said in an emailed statement that it “will read the complaint thoroughly and evaluate if there are things we can do to improve. Because YouTube is not for children, we’ve invested significantly in the creation of the YouTube Kids app to offer an alternative specifically designed for children.”

That toddler-oriented YouTube Kids app, launched in 2015, offers more parental controls but is not as widely used — and features a selection of the same videos and channels that kids can also find on the regular YouTube service.

Although it’s not known if the FTC will take action, the complaint comes at a time of increased public scrutiny over the tech industry’s mining of personal data and after the FTC opened an investigation last month into Facebook’s privacy practices.

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For that reason, the FTC “may be more reinvigorated and ready to take these issues seriously,” said Josh Golin, director of the Campaign for a Commercial-Free Childhood, which drafted the complaint along with the Center for Digital Democracy and a Georgetown University law clinic. Several other groups have signed on, including Common Sense Media, which runs a popular website for families, and the advocacy division of Consumer Reports.

“I think the day of reckoning has arrived,” said U.S. Sen. Edward Markey, a Massachusetts Democrat who co-authored the 1998 law and says he wants the FTC to look into the YouTube complaint. “Americans want to know the answers as to whether or not the privacy of their children is being compromised in the online world.”

FTC spokeswoman Juliana Gruenwald Henderson said the agency looks forward to reviewing the letter. She said the FTC already has brought more than two dozen cases for violations of the 1998 law. It has settled child privacy cases with Yelp, mobile advertising network inMobi and electronic toy-maker VTech.

None of those services are as popular for kids as YouTube, which has toddler-themed channels with names like ChuChuTV nursery rhymes, which as of last week counted more than 16 million subscribers and 13.4 billion views. It also has many channels that cater to preteens.

Kandi Parsons, a former FTC attorney who now advises companies on child-privacy compliance, said that because YouTube is a general-audience service, it could be hard to determine if parents are curating content for their kids to watch or letting them use it on their own. Parsons said the FTC so far hasn’t gone after kid-directed channels within broader media websites, though that doesn’t mean it won’t.

Consumer advocates say Google knows what it is doing. They point to its “Google Preferred” program that allows advertisers on YouTube to pay extra to get their ads on the most popular videos. The program includes a “Parenting & Family Lineup” that has featured channels such as ChuChu TV, Fox’s BabyTV and Seven Super Girls, whose topics include “fluffy unicorn slime.”

YouTube does block children who identify themselves as under 13 from posting video, by prohibiting them from creating an account to begin with, but an account isn’t needed merely to watch.

“It’s laughable if Google execs claim that they think the parent is in charge of the online viewing behaviors of tens of millions of children,” Chester said. “Children are watching this content by themselves. Google is trying to look the other way.”