Yes, but the “any domain with sci-hub in it can be taken down without further legal action” is not standard for actions against domains; usually it is seizure or other action against specific domains.
Cloudflare isn’t a monopoly/chokepoint to the extent that actions against domain registries (via registrars) are.
Cloudflare isn’t a monopoly/chokepoint to the extent that actions against domain registries (via registrars) are.