Killing the existing ones is much more of a jerk move. Particularly so since Google is still keeping it around in some form for internal use by their own apps.
Edit: Google is using a g.co link on the "Your device is booting another OS" screen that appears when booting up my Pixel running GrapheneOS. Will be awkward when they kill that service and the hard coded link in the phones bios is just dead
Possibly those other ones are just using the domain name and the underlying service is totally different, not sure.