Acceptable use policy? huh. I wouldn't put money on "after an initial review" meaning anything more than "algorithm was triggered" but AUP violations are illegal content/products, gambling, anything that requires a license etc.
It wasn't an album that has drugs or gambling in the title of it was it? Or since it's Germany anything that could be seen to be Nazi related? That could seriously trigger something if it tripped the right systems. I'm well out of that world these days but it's the kind of thing that gets looked at quite fast.
Hmmm - one of them had the word "Soviet" in the title - perhaps I'm going to have a visit from the lads with the shades? Nothing narcotic or gambling related - boring bastard that I am