How long do you think Binance will hold out for before making it mandatory? I don't think they will for long.
Binance fled to Malta not that long ago, and for the time being they are safe in my book. The only thing I expect them to do in the near future is to start rejecting US citizens in an attempt to shake off the US authorities.
Some of the largest exchanges have already been doing so for quite a while now, and it's the safest possible move because of how active the US authorities have been and will be getting in the coming years.
Anyone who thinks Malta won't immediately roll over when ordered to is delusional. It's purely a matter of time before the pressure is put on. Will Malta ignore the rest of the world and embrace one Chinese bloke or protect the 99.999% of their economy that isn't crypto related?