I think I now got it, in the wireguard profile I added an app I wanted to use this profile and checked online for myip and it didn’t show mine. So basically, since Android let’s you run 1 vpn service, rethinkdns can do this by adding a wireguard profile from a different vpn service like protonvpn in my case. This is very clever and convenient. I hope my understanding is correct.
That’s so intimately hot!