Eh it's not new, Apple is pretty much the reason tumblr got rid of nsfw content (I've heard it's sort of back now but idk I'm never going back to tumblr).
It's why even if an app in the app store is rated 17+ it still can't really have nudity in it.
Then why Reddit and Twitter continue to have NSFW? Why I can open Safari and see porn if I want to? Should not be that removed from AppStore and iOS as well?
Because apple enforces things asymmetrically based on where the eye of the conservative news cycle is.
NSFW content for tons of apps is buried in account settings that can't be changed from the iphone app but have to be changed from the browser. They've been doing this for a damn decade bro.
It's why even if an app in the app store is rated 17+ it still can't really have nudity in it.