it's not their job. the same way it's not apple or spotify's job to screen the music that goes on their platform, or amazon to be ok with the content of the books they sell. as long as something isn't breaking the law, it's not up to the platform holder to put any extra step before allowing it.But nintendo is also clearly not doing anything about this type of trash that is linked in the picture that began this discussion, which means they are not even trying to turn to change the regulation.
This purposeful ignorance to the gross content on their platform is far worse
and even sony, it's not like they're doing a good job if that's their goal. they're half-assedly asking devs to make some slight cosmetic changes. if they actually believed in the things you and other posters here are saying about those games not being ok, they would have just completely denied those games and de-platformed those devs/publishers. instead they still allow the games after some slight alterations.