DAI added a 2nd coin, USDS, that is "regulatory compliant" = can be frozen.
worry about all the USDC collateral they use but at least it would be an all or nothing sort of thing for that to be frozen.
I think (not positive at all) holding another smart contract that pools fungible usdt/usdc cannot get blacklisted, including selling/transfering that contract for something other than usdt/usdc.