Not sure what you mean. Sure you can buy any domain and put it behind. But ultimately you are much easier to doxx. Between whois, server IP etc. Then there is the issue of the security on that server too, but that's another story. What would be better is to have a way to put this behind TOR/I2p, that would make things a bit better.
On a centralized website the issue is less present as only the admins of the server can see the details about you, ip etc (maybe mods can too on reddit, not sure), here everyone can see everything, it's a lot more invasive imho. Everytime you upvote/downvote something, your account handle is saved on the post as upvoter/downvoter. This is very juicy data to build profiles and analytics on people.