What I find confusing is that the German Citizens are targeted. Twitter, TikTok, XHamster, etc.. are hosting the images. Why are they not fined for not providing a system to check that the user is above a certain age?

Or do these people not flagged their images as 18+/Offensive to children? Is that the problem here? But this isn’t possible on Twitter, which does not make such age-verification or age-checking tools available.

So, if they only post content on sites with age-restriction, they're fine?