[zalew]

I anonymously contributed mostly to automotive pages, and mostly for the Polish versions. I found everything in English got reverted, in Polish the vast part holded up (even a link to my own on-topic website). Probably regional versions aren't that nazi as the main one, although I've seen crazy discussions on every subject even mildly touching politics, for obvious reasons (some zealots are just ridiculous).

[mjn]

I think it varies a bit; the German Wikipedia is actually considerably more strict on inclusion criteria than the English Wikipedia, but others are less strict.

[zalew]

Maybe. I always avoided getting into 'somebody is wrong on the internet' over touchy subjects, rather filled in technical data or trivia on my hobby topics or more often niche wiki sites (not wikipedia.org). Sometimes I regret the lost street-cred of doing it anon.