[onlyusername]

>On Android, the NextDNS app registers itself as a VPN

It does this for macOS and iOS too, which has caused issues when both were trying to set the DNS on the machines.

[whatsthatabout]

This is particularly unlucky for macOS if you want to use a application-firewall like "Little Snitch" - since Apple removed kernelextensions on macOS (which LittleSnitch and others used before) they now have to also fake a VPN. Because of this, you cannot use a custom DNS and Little Snitch. [1]

[1]:https://github.com/AdguardTeam/AdGuardDNS/issues/214