Well, there's no FDIC, so there's no government making sure you get your money back if the organization holding your money shut down.

There's a number of companies offering something similar, like Celsius and Blockfi and a few others. Do your own research, and no need to go near it if not comfortable with it.

Things could go either way from here on out, perhaps crypto is the future and 8.88% interest for stablecoins will be the standard; or perhaps it'll all come crashing down and all cryptos go poof in a few years. Who knows? Point being, when a new paradigm comes along, it usually seems strange and uncomfortable enough to feel suspicious. Maybe it's legit, maybe not, there's a chance for either case.

The exact number "8.88%" kind of screams "scam targetted at Chinese culture".

That number varies, it's a weekly rate. I've been with Celsius for a while now and I know USDC interest rates used to be 10+% not too long ago (a couple months maybe?). Also, that's just their US rate for USDC and a few other assets. BTC interest rate is 6.2% right now. Internationally, the USDC interest rate is 11.21% with rewards in CEL.

Celsius is a British company and is also HQ'd in the US now.

There is a catch, but you won't find out what it was until they loose all of the money they are holding. There is probably a 50/50% chance this is just a Ponzi, and if it isn't it is some complicated strategy which can not handle black or even grey swan events, and there is a 5% chance there is a bug in their code that allows for all the funds to be stolen.

But in the mean time you can get an 8% return.

"50/50" is pure speculation.