Trump supporters are flocking to social media sites MeWe, Gab, and Rumble amid a crackdown by Big Tech on violent posts.

Gab, a service that claims to champion free speech, said it added 600,000 new users over the weekend. Meanwhile, MeWe, a similar service, said it has added 400,000 users every day since Saturday and now has more than 14 million members.

The gains follow Sunday’s shut down of conservative social network Parler, which went offline after Amazon web hosting service dumped Parler as a customer because of violent posts and threats in wake of the Capitol riot. Shortly before, Apple and Google had banned Parler from their app stores.

Adding to the increased interest in alternative social media sites are bans by Twitter and Facebook on President Trump and other high-profile conservative personalities. After the Capitol riots, Twitter and Facebook both booted Trump from their services for inciting the violence.

On Monday, Facebook went to the additional step of removing content containing the phrase “stop the steal” in hopes of preventing future violence. The phrase is a popular rallying call of Trump supporters who falsely believe there was widespread fraud in the presidential election.

“It’s almost like the perfect storm,” said MeWe CEO Mark Weinstein. “The melting pot of people coming to MeWe are coming from all directions.”

MeWe was the fifth most popular free app on Apple’s App Store and Google Play on Monday. Weinstein hammered home the point that his goal is to be “more vigilant” in moderating content on his service, and that he does not want to be an “anything goes” app—a thinly veiled swipe at Parler’s lax approach.

He said that MeWe has just shy of 100 content moderators who review posts on its service, and that they actually adhere to “strict” terms of service that includes the possibility that they’ll alert authorities about any concerning posts. But on Monday, several QAnon and “patriot” private groups could be found, one of which called Patriots Unleashed asked users if they were “armed and ready” before allowing them to join. MeWe removed Patriots Unleashed from its service after Fortune‘s story published.

Weinstein acknowledged that some of MeWe’s user growth has been due to Parler shutting down. But he added that the app was growing prior to the election and riots. As a result, he said MeWe’s users have a wide array of political views, and are not just Trumpists.

“Those other guys, they’re opinion chambers,” he said about Parler and Gab. “We’re a social network.”

The rise of alternative social media services began late last year after Facebook and Twitter began labeling and removing more posts on their services for election misinformation. Conservatives considered the crackdown to be evidence of bias against them and President Trump.

For example, Rumble, a little-known YouTube rival, suddenly soared in popularity. Over the weekend, users downloaded its app 162,000 times, a nearly 10-fold gain from last weekend, according to data from mobile analytics company Sensor Tower.

But Mark Shmulik, analyst at investment bank AB Bernstein, said he doesn’t expect the latest rise in popularity of MeWe and Gab to be long-lasting. “It’s a fad,” he said. “There will be a little niche, but it won’t disrupt what we’re seeing on Twitter.”

Shmulik said Twitter and Facebook, though growing slower, are far larger and also attract a more diverse set of users with a diverse set of thoughts. That’s what makes big social media companies more engaging than the upstarts, he added, which he described as the “equivalent to Trump rallies.”

“You can continue that, but at some point you have to reach the masses,” Shmulik said.