Most people I know who use Linux wouldn’t trust Cloud services cause that’s just storing your stuff on somebody else machine. You can self hosted service like Next cloud on a raspberry pi or just get comfortable with networking enough to setup VPN and ssh into your home computer from the net to get your stuff.
Doesn’t seems to be an official ban. My friends in Vietnam are still able to access Steam just an hour ago. This is most likely a situation like those manga websites black listed by Comcast or AT&T DNS.