I know this, I've experienced this. There is not a concrete source for what I'm saying here.

I remember reading the article about a nudist family photographer. The English Wikipedia article was highlighting the controversy about child pornography that came with it, almost trying to demonize the guy, while the German article was actually trying to go beyond and develop the article. There are enormous discrepancies on that website.

Wikipedia has some bizarre articles and rules. I can only provide some pieces and bits of anecdotes.