There is not freezing of accounts that is going to happen here because in the first place bitcoin is not recognize by the state as a legal tender, so whatever you do with your bitcoin it cannot be trace we are transaction in the blockchain where it is decentralized and no one can control it.
Freeze accounts can happen if people are using exchange site in storing their coins.
If by any means they are using offline wallet or hardware then that you called it somehow "safe".
Account freezing will only take place if you are doing something suspicious on a reputed exchange, or if the exchange ain't a good one, then there is a possible threat to your coins if you are trading on an exchange just seeing higher prices on it... Storing them on any exchange is not recommended because not only freezing is a possibility, but there might also be a hack and that would be the worst scenario from which even recovery ain't possible...