It can also run directly on lower powered machines. GL.iNet routers are a good example, they’re based on OpenWrt and come with AdGuard Home support out of the box, so no need for a whole external computer to handle DNS stuff. Sure it’s limited by ram about how many lists you can have, but still. Pihole is much more “substantial”

Personally I don’t trust Proton. I know I’m paranoid, but can’t be too sure about anything these days. To my knowledge MV and IVPN are the only ones with a nice privacy reputation. Shame they are cutting port forwarding

No public audits - I don’t trust. Italy is also not exactly a privacy (and personal rights) haven.