Gab, a "free speech" alternative to Twitter that's popular with the far right, has been shut down after losing service from a number of mainstream technology platforms, including PayPal, Joyent, Medium, and GoDaddy.

"Gab is under attack," the company's home page now reads. "We have been systematically no-platformed by App Stores, multiple hosting providers, and several payment processors." Gab is working to get back online using new service providers.

The attacks on Gab follow revelations that the man accused of Saturday's deadly mass shooting at the Tree of Life Synagogue in Pittsburgh appeared to be a regular Gab user. An account with his name was "rife with anti-refugee, anti-Semitic and white supremacist posts," according to The Washington Post. One post complained about a "kike infestation."

The account's final post referred to the Hebrew Immigrant Aid Society, which works to resettle refugees in the United States: "HIAS likes to bring invaders in that kill our people. I can’t sit by and watch my people get slaughtered. Screw your optics, I’m going in.”

Hours later, 11 people lay dead.

Gab is two years old and claims around 800,000 users. As mainstream social media sites like Facebook and Twitter have cracked down on hate speech, Trump-supporting entrepreneur Andrew Torba set up Gab as a "free speech" alternative. Gab bans explicit advocacy of violence, but garden-variety hate speech is allowed on the platform. Gab's permissive rules have attracted far-right figures like Richard Spencer and David Duke.

Gab has repeatedly clashed with major technology platforms over concerns about the extremist content on the site. Gab was forced to change domain providers in 2017 after its old provider threatened to cancel the site's domain. Also last year, Google banned Gab's app from the Play Store, citing the app's lack of hate speech filtering. (Apple never allowed Gab to offer an iOS app in the first place.)

In August, Gab was nearly banned from Microsoft's Azure platform over anti-Semitic Gab posts. Gab got a reprieve when the Gab user behind the posts agreed to take them down.

But in the wake of the Pittsburgh synagogue shooting, Gab has faced a lot more pressure from mainstream service providers. PayPal banned Gab over the weekend, as did payment processor Stripe. Medium and Joyent also refused service to Gab. The final straw was GoDaddy, which gave Gab 24 hours to find a new domain provider.

It's a bit surprising that Gab wound up on GoDaddy because GoDaddy was one of the first domain providers to ban the neo-Nazi site the Daily Stormer last year. That led to a weeks-long period where the Daily Stormer jumped from domain to domain, looking for a provider who was willing to provide it service. Two key Daily Stormer figures—editor Andrew Anglin and technologist Andrew Auernheimer—started using Gab as their primary communications platform.