JakobFel: Ironically, the existence of this stuff might eventually end up placing GOG within those very same laws (specifically if Poland implements them), since many of them have a percentage threshold of adult-only content that would legally require them to comply with age verification systems.
That's a very "US-centric" viewpoint, usually in Europe sex/porn is not consider as absolute evil while murder and violence is standard family friendly fun like it might be in the US, usually it is the opposite. So even if Gog didn't had a single porn games on it it would have, sooner or later, to implement EU age verification laws because of games like Cyberpunk, Witcher 3 and all the other PEGI18 games that are considered adult-only content.
Heck where I live a 16+ year old can legally purchase and watch all the porn he or she want but needs to be 18+ to purchase Witcher 3.
Rude|boy: but pornography was kept in the back room with a curtain for a reason in the 80's/90's.
Not everywhere, when I was young, in the 80s / 90s, porn and video games where usually kept in the same corner, and there was no curtains, first it was in the libraries where the video games magazines were right next to the adult ones (probably because they were then considered to be "guys" stuff) usually games on the bottom shelf and adult on the top shelf, and later, when CD-Rom became a things, all the very badly encoded porn movies being on the same shelves than games, and I am not talking about some obscure shop but major mainstream chains.
If anything things have become a lot more "sanitized/controlled/hidden" nowadays that they were back then.