For some reason in mid-2016, Flickr locked my account. I mean, a hard lock. Couldn't login, public photostream was "account locked", the whole thing. My photostream was pictures of airplanes, random street photos, and general middling-quality randomness. Nothing NSFW, political, or otherwise.
I contacted Flickr support and after a few days finally made it through to an email exchange with what I assume was a live person. They said that the account was under a "support lockout" and there was nothing they could do to release it. No reason given, just a "support lockout". That was the last I heard from them, ever. They stopped responding to any emails or other support requests.
Sad, really, as I enjoyed some of the groups there.