There's no such thing as a decentralized stablecoin.
I have given concrete examples of decentralized stablecoins backed by bitcoin: smart contracts that issue tokens redeemable for 1 dollar worth of btc.
I'd never touch a stablecoin that wasn't regulated and backed 1:1 in reserves custodied by a chartered bank
Backed by what? Why do you trust banks and regulations more than a smart contract?