It isn't about you-the-project-maintainer, it is about you-the-project-contributor. That criticism seems to come from the latter, i.e. people who dislike SourceHut's workflow and feel that if they want/need/have to contribute to a project hosted on it, that project's workflow would be forced on them. From that perspective it makes sense that there would be people that try to dissuade others from hosting their projects on it.