Well, you can see how that's a bit of a bigger ask than "go to Twitter.com and click SIGN UP," right? :)
People really, really want to argue that decentralization of social networks doesn't make things harder, but eventually the defense always shifts to "well, you have to be willing to jump through a few hoops if you believe in the advantages of a decentralized/indie internet, which you totally should," because the truth is that the decentralized way does make things harder. Personally, I do believe in the advantages of the IndieWeb, and I do think it's worth jumping through those hoops. I just think we need to acknowledge those hoops exist, and always be thinking about ways we can reduce the friction for people who say "I like all those ideas in theory, but in practice it's too frustrating."