Not such a bad idea

Given Flathub distributed at least one game that would surely be classified as "not for kids" (the old Katawa Shoujo package), and now distribute a new modernized version ( https://flathub.org/fr/apps/sh.fhs.ksre ), I think that at least flatpak/flathub would be covered by the spirit of the law.

I do not know if the new version is the same as the old, but nothing indicate that the content was removed, and this is easy to verify.

For people who prefer to read code, there is some code around handling adult content on https://codeberg.org/fhs/katawa-shoujo-re-engineered/src/...

For people who prefer text, I think the game/script-a4-lilly.rpy file around line 3610 would be one of the clearest place.

And for those who prefer images to text, there is some explicit pictures in one of the game/event folder.

And of course, for people who want to test the game, you can just finish it in around 8h ( https://howlongtobeat.com/game/4943 ).

IIRC, there is a option to turn on/off the NSFW part, and I do not know if this is on or off by default. But I do not think this matter that much in practice, except that this is one example where a unified API would be useful (eg, something for parental lockdown).