There's no "stopping being on chain" (not sure exactly what you mean by that). But as for stopping all transactions: None of the other major ones have their o

There's no "stopping being on chain" (not sure exactly what you mean by that). But as for stopping all transactions: None of the other major ones have their own blockchain but are smart contracts on other chains. However, at least both USDC and USDT have mechanisms in their smart contracts to freeze accounts and transactions. I have not looked up TrueUSD, not sure how that works. DAI does not.