It's likely against the ToS rather than illegal. But if they're deleting IDs correctly after verifying I guess you just have to get past 30 days
In my jurisdiction, it's clear- cut: yes, that would constitute a forgery.
Of course I agree this doesn’t worth it. If they force an ID I would just abandon the platform.
Of course I highly doubt they'd sue. They either just don't let you in or you abandon them. I'm with the latter.