That's not how the argument and poem[1] goes. If a devops team for a pro-choice campaign was being censored on SourceHut because it does not align with Drew's moral compass, nobody would defend this with "well, they can just run their own git hosting services, so what's the problem?"
A lot of people building crypto tools also are happy to use centralized services like GitHub, SourceHut, GitLab, because they might not be satisfied with the alternatives.