This is all a good point but it's also making it sound like there was a global internet ban put into place rather than one website making an odd decision. I was mostly speaking to the "rip tumblr" posts (though if the majority of the userbase is actually affected then maybe rip). I'm sure both the production and consumption of explicit are will not suddenly stop and that alternatives will either appear or already exist for those communities.
With the ammount of fascists and generally horrible men trying to crack down and shame anything that does not zieg heil, there kind of is, right now, a soft global internet ban on not comforming.
I mean, you can, but then you have to deal with harassment, which is a horrible thing to demand of people. I mean [2], this is why we have this site, right? This is why losing NeoGAF forced us to build another forum, because we can't just join any forum because most of the internet is infested with nazis.
Tumblr has nazis, but you could, somehow, do your kinky and/or LGBTQ shit there and be relatively free from harassment. Finding places on the internet where nazis are not putting their own rules about what is acceptable and what is not is incresingly difficult.