I really don't understand why they don't just join a NSFW instance and be done with it. That's exactly the point of an instance: focusing on meta interests. On top of that those instances are already up and running. It's not as if they had to do it from scratch.
Why would you inflict this on people who don't want it? There is an adoption risk, there is a legal risk...It's not worth it! Why would we take the risk of being defederated by big federations or big names just so a bunch of you can spread more NSFW?
There is a toggle dedicated for it, which means it's a point of contention. Go to a safe space, to an instance where there is no contention. Use the fediverse.
NotTheOnlyGamer