I agree with Doctorow's goals here, but framing it as he does at the start of the piece doesn't make any sense. He claims we need to fix big tech abuses, then gives as examples of issues to fix disinformation and copyright infringement.

Those aren't big tech abuses; they are two systemic side effects of the internet itself... Of a technology that disintermediates gatekeepers from peer to peer communication. If anything, big tech serves as a gatekeeper that has any chance at all of addressing those issues. Empowering communities and individuals to escape monopoly platforms decentralizes disinformation and copyright infringement and increases the severity of those problems.

I think there are good reasons to decentralize the current mega platforms we have, but addressing disinformation or copyright management aren't them.