I don't agree with the author's conclusion. I believe that Fediverse and FOSS software will eventually become better and less daunting for users to use. They will eventually rule the social scene.
Why? Enshittification. Capitalist platforms objective is to make money. As long as that's their objective, they will always become worse. FOSS projects are truly social project where the ultimate objective is to create libre software for the sake of human connection. Money is not the ultimate leitmotiv of FOSS.