Stable Diffusion is developed at LMU Munich and this particular line basically paraphrases ยง 184 of the German criminal code, which makes it a misdemeanor crime to put porn in places reachable by minors or to show porn to someone without being asked to do so, among other things. I dunno why they felt compelled to include it though.
Regarding your examples, most of these are technically criminal in Germany, because the only legally safe way to have a place not-reachable-by-minors means adhering to German youth protection laws, which you're not going to, just like every porn site, Twitter, Reddit etc.
Regarding your examples, most of these are technically criminal in Germany, because the only legally safe way to have a place not-reachable-by-minors means adhering to German youth protection laws, which you're not going to, just like every porn site, Twitter, Reddit etc.