The number of states involved in the investigation is a surprise. Ahead of Monday's announcement, The Washinton Post, in a separate report, said approximately 25 attorneys general would be involved in the probe. The investigation comes at a time when both Democratic and Republican lawmakers have expressed concerns that a handful of companies control too much power. Google, in particular, is likely to face intense scrutiny. On Friday, Google confirmed that the Justice Department asked the company for information as part of its ongoing tech competition review.

In response to our request for comment on the investigation, Google pointed us towards a statement the company published last Friday. The post was published in response to news about a Department of Justice investigation and a few days after news first broke about a group of attorneys general looking to start an investigation of their own.

"We have answered many questions on these issues over many years, in the United States as well as overseas, across many aspects of our business, so this is not new for us," Google said in its post. "The DOJ has asked us to provide information about these past investigations, and we expect state attorneys general will ask similar questions. We have always worked constructively with regulators and we will continue to do so."

It's important to note that this investigation isn't a lawsuit yet. However, if Google is found to have acted in a way that broke the US's antitrust rules, the company could be forced to divest itself of parts of its business, including YouTube. Alternatively, the company could be forced to change how its key money-making algorithms work.