Yeah - there's no real advantage to crypto, even less so for a stable coin (it really seems to be someone /trying/ to make crypto look legitimate, with absolutely no reason to buy.
Here's how a buyer of the coin should see it - I have 1 USD and I can put that money into a bank, into my pocket, or under my bed mattress.
If I buy a crypto stable coin.. I can hope that the coin doesn't fall over (as others have), and, uhhhh, that's about it.
The owner of the stable coin might be able to trade it with someone else, for goods or services, but the only reason either party would switch from the fiat currency to the crypto is to avoid regulation, whether that be because the goods/services are controlled, or because the transfer of money is controlled.
Any thought of "investing" the dollar into the "stable" coin is void, because it's a stable coin that's supposedly fixed to the value of the dollar, one goes in... one comes out
Payment of interest for holding the dollar, that's regulated, and the risk of the coin disappearing, or being shut down by the feds means that the reward would have to be high to make it worthwhile (IMO)