Where are those interest payments coming from? Bonds (and in the old days, bank accounts) pay interest because they lend out the cash. They don't hold it. Those interest payments on crypto are coming from new speculators buying in. It's the definition of a Ponzi scheme: Paying early speculators with proceeds from late arrivals. And if they're lending out coins at interest, they're lending to speculators, because no actual functioning business borrows crypto for their operating expenses or to expand their operations. And nobody but a speculator borrows crypto because you could well have to pay it back at astronomical rates because the coin you pay back could be worth double of what it was when you borrowed it. Nobody would lend crypto either because it could go the other way and you get back a fraction of the value you loaned. It would be idiocy to borrow or lend crypto except for speculation. And that's how any legitimate financial institution functions: By borrowing and lending currency that has a stable value and can be used by the borrower for something useful.
As for "stable" crypto pegged to dollars, that's a house of cards. They're holding the exchange rate steady by buying coins back at a fixed rate, but that only works as long as new speculators keep buying in. I don't remember which crypto it was that claimed to actually hold dollars to back its coins, and investigators found that they didn't even have dollars, just commercial paper, which wouldn't have been so bad except that they didn't have nearly enough of it to actually cover the coins.
There's a reason why nations have a single currency: There was a time when currency was issued by banks, and every bank had its own. It was total chaos: Nobody knew what any one currency was actually worth. For a modern economy to function, it needs a generally-accepted and predictable currency. With a hundred different cryptos, how are you going to buy a gallon of milk? Do you really expect your local corner convenience store to accept all of them? Maybe you're visiting a friend a half a mile away and it's more convenient to buy your milk at a different store that day, but they accept a different crypto than you have. Now you have to change your coin to a different crypto. It just won't work! Crypto is great for ransomeware criminals because they can demand you pay in the crypto of their choice. Other than that, it's just speculators.