Zynn topped the US App store charts this week, passing both TikTok and Zoom.

The short video app looks a lot like TikTok — users scroll through 15-second clips uploaded by others, where they can like, comment, and share.

Zynn, however, rewards users for watching videos in a very real way. They earn points that can be exchanged for in-app purchases, gift cards to stores like Amazon or Walmart, or cash through PayPal. Signing up earns $1, and inviting five friends earns up to $110. These rewards are currently only available for those in the US and Canada.

One YouTuber reported making over $1000 in a day on Zynn. But others are less convinced. Venture capitalist Turner Novak even called the app a giant pyramid scheme.

A TikTok clone called Zynn suddenly appeared at the top of the US App Store today.

It looks like a giant referral pyramid scheme, but also may be getting bankrolled by one of TikTok’s biggest rivals in China, which just raised $2 billion from one of its OTHER rivals. pic.twitter.com/5w4kPGAoC3

— Turner Novak (@TurnerNovak) May 27, 2020

I’m just gonna call it: Zynn is sketchy as hell. Most of them are viral vids scraped off the internet with no credit. Lots of weird user IDs that have “united states” in them. Some post vids in chinese, then english, then spanish. some contents are directly ported from Kuaishou. pic.twitter.com/AEaF6mnkb0

— cd/dc:// (@LichtSpektrum) May 28, 2020

Zynn’s strategy isn’t new: e-commerce platform Pinduoduo and news app Qutoutiao have both incentivized users with money.

While Zynn has only been released for around a month, it could mean serious trouble for TikTok — but is that an accident?

The app store shows that Zynn was created by Owlii Inc., and The Information reported that the company is now owned by Kuaishou. Kuaishou is a $30 billion startup backed by Tencent, and the biggest competitor to Douyin in China.

While Kuaishou has over 300 million daily users, Douyin has over 400 million. Earlier this month, Kuaishou sued Douyin for interfering with search results on the app store.

Zynn’s rising popularity in the US could further escalate scrutiny on Chinese apps. The Committee on Foreign Investment in the US has previously launched investigations into ex-Chinese-owned Grindr and TikTok over user data concerns.

TikTok has since been trying to erase its ties to China. It recently appointed Kevin Mayer, former Disney executive, as its new CEO.

We can expect Zynn to keep growing as people stay bored in Covid-19 quarantine — and as they look for new ways to make money.