[yndoendo]

I thought parts of the Android OS can by-pass the VPN so the firewall becomes ineffective against blocking Google, OEMs, and others that have root. Wouldn't the VPN API being used as a firewall also prevent one to use a VPN client at the same time?

[khimaros]

for the latter, Rethink can be configured to work with eg. a wireguard VPN because it has a built-in wireguard client.