I thought USDT can be frozen on Ethereum and other blockchains because USDT developers made it to be like that. Or am I wrong? If USDM is created on blockchain like Ethereum, I do not think it can be frozen. But not on blockchain that is very more centralized like BSC and the beacon chain which their developers can freeze any coin of their choice. I think it would be better to even just hold the coin on Cardano blockchain.
I don't know if USDM will ever move to other blockchains or if that is even possible while keeping the same properties like on Cardano blockchain.
Maybe I am wrong but it's probably not so hard or expensive to crash down and spam Cardano blockchain, that way you could in theory disable and destroy USDM also.
And I wouldn't really call most of the altcoin blockchains decentralized.