Will they get banned or restricted immediately?
Hard to tell. I am also following this on reddit where many people asked this question. I
Many of them are scared to verify their account now but they want the bonus, haha. In the past old accounts of users that are "now" a restricted region were not impacted. My account is also verified since forever, with a German address (while Germany is banned now) and I never had any trouble. Since I live in Japan anyway even of trouble comes up I can just change the address if needed, confirmed that with my host.
If I was you I would maybe wait a bit longer until some people share their experience of what happened when they verified with an ID from a banned region.
I mean if you use an US passport it doesn't necessarily mean you you live in the USA, right. Important is the residency, not the Nationality.