GrapheneOS also allows you to change internet connectivity checks back to Google, so you can blend in with billions of other devices if you’re using a VPN or Tor because internet connectivity checks are made outside of a VPN tunnel. So changing it back to Google might be useful if you want to hide the fact that you’re using GrapheneOS.
You can also disable them, but it would still make you stand out, and things like captive portals, etc. would break.