I did, battery drains 5-10% faster.
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ReThink DNS uses the VPN service as well, by the way.
And it is possible to use two VPN apps, see https://news.ycombinator.com/item?id=41933464 (yes, the battery usage adds up).
Rethink DNS seems fine, anyhow.
> ReThink DNS uses the VPN service as well, by the way.
Rethink (since a year ago) has had the ability forward connections per-app to multiple WireGuard upstreams at the same time.
https://old.reddit.com/r/rethinkdns/comments/15r1eq9/v055_mu... / https://archive.md/RqUPe (to us, it turned out to be a deceptively difficult thing to integrate with the rest of the firewall).
I'm unsure if we'd be able to support all of Tailscale's features as easily (taildrop, exit nodes etc), we'll see.