All reddit NSFW content has been removed from /r/popular and /r/all about two months ago.
I think they're getting ready for an IPO.
All that porn probably won't be there anymore in a few years.
Bingo. Back in the days one of the most popular subreddit was /r/jailbait (I won't explain what that is here, you can search for it in DuckDuckGo in private mode). Back in the days free speech was huge on Reddit and the admins did quite the mental gymnastics to appease the concerns of the community over free speech. Of course this was done just around the time they got investor money.
Not that I mourn the loss of this kind of content but it really makes you think how low free speech have fallen in terms of priorities going from "we won't even ban jailbait" to "let's ban distasteful subs" and being more prude than my religious grandma in certain aspects. Now it's nearly impossible to post a link in the default subs and nearly all the top comments are obviously bought accounts.