I was following until the mention of Twitter and Reddit. They should face every single challenge that Tumblr does regarding porn. What do they do differently? I feel that Tumblr should be able to overcome these issues.
I was about to say the same thing. Reddit is a huge host for pornography, and Twitter is where most sex-workers share and network currently. Reddit certainly has advertisers and an iOS presences, not to mention people b̶u̶r̶n̶i̶n̶g̶ ̶m̶o̶n̶e̶y̶ ̶o̶n paying for awards. I can't speak to Twitter because I'm not on the site, but my understanding is that neither bother with any formal age verification either. Not sure what's different except maybe the size of their legal team.
This. Twitter and Reddit in 2022 are every bit as unregulated as Tumblr was in 2007, and I don't see any talk of major challenges or changes desired on their parts.