Why doesn’t everyone use DAI instead of USDC and Tether? Are stable coins like DAI the future of stable coins?

I really wonder why DAI isn't used more. In my view DAI has really big advantages over USDC and USDT. DAI is truly decentralized, since it's not backed by usd. It creates it stable value just by smart contracts so regulating this kind of stable coin seems impossible for me. While regulating a centralized fiat backed stable coin seems way more possible to me. I think these kinds of stable coins are the future of stable coins, because they leverage the power of decentralization and smart contracts. What do you think about this?