Question: why didn’t the more safety-focused developers just fork the project? I feel like fork-o-phobia causes 90% of the incidents like this.
Another (persistent) problem has been the crates.io namespace.
You can fork actix, but then you'll need to come up with a new name for it, and then educate the wider community of that. It is a big hassle, and slows adoption.
Adding onto the issue is that crates.io does not (yet) support the username/projectname naming scheme as on github and other popular code repositories. So it isn't enough to just people to go to a different username, you must use a new project name.