Tyranny does not care about "proof".
It doesn't even care about plausible deniability.
Best you can get away with is lack of suspicion. Have a secondary phone with some standard apps on that you use now and then so theyhave a history and just look like you are just not a technical person and read novels on dead trees instead. A lot of work but likely works.
are we seriously approaching a point where its quasi-illegal to not participate in the socials?
More like they've looked you up and the apps being missing would be a giveaway about the dummy phone
So it’s becoming illegal to not have the Facebook app installed on your phone if you have a Facebook account?