DAI is like USDT but it is decentralized and cannot be frozen. It runs on Ethereum's network. I'm not sure if there is such thing as DAI-TRC20, DAI-BEP20 and so on.
(Also, this reminds me of BRC-20, which was supposed to be like this. Who even uses that anymore? Lol.)
I know about DAI but I didn't know if it is really decentralized. Since it is running on ETH network, yes, the main chain is ERC-20. But I just checked coinmarketcap and found that DAI is available on 24 more blockchains which means yes, there are things like TRC-20, BEP20 and many more. But the ETH chain is the main chain for DAI which makes me to think about the transaction fees.
I remember I didn't like ETH because of the transaction fees. If someone use DAI on a wallet like Metamask, they have to keep ETH or BNB to pay fees for their DAI Transaction. But, the main problem is transaction fees on ETH main net. ETH transaction fees sucks. Sometimes you have to pay $10 fees to send a $5 transaction.
Also, I figured out DAI was at 0.96 at some point in 2020. Not sure if it was because of the multiple chain issues or if it was de-pegged.