I thought this as well. Also, anon posting, no login, is one reason of the success of, well, anon boards. There is a precedent regarding decentralized boards and failure due to difficulty to post. Dchan. It worked very well. And was inherently protected to spam, since you had to spend a very small fee in the coin polygon to post. Something like less than a cent. Problem is, nobody wanted to buy polygon in order to post. Because it's a hassle for the average shitposter. So soon the developer was the only one posting. Plebbit developers say they are working on a challenge based identity. You solve a certain amount of captchas, and then you have an identity with which you can post. Back to the .eth domain, not all people interested in decentralization are into crypto. And among those that are in crypto, some are Bitcoin maxis, who won't buy .eth domains anyway.