As for the stable coins, the researchers from the University of Chicago claim that their stability is a bit more nuanced. Especially, even a stable coin cannot defend against a run https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4226027
This doesn't seem to encompass stablecoins that are fully-collateralized, as many claim to be (which is disputable in a lot of cases).
Getting money from users for a token on which you pay no interest and getting the full interest yourself does seem like a good business, it's just not one that would attract customers that have better options.
Getting money from users for a token on which you pay no interest and getting the full interest yourself does seem like a good business, it's just not one that would attract customers that have better options.