Any reason not to use something like Quad9 over my ISP provided resolver?

General
1

I use Mullvad VPN anyway so my understanding is that everything is encrypted via that tunnel, but for others connecting to my network, I suppose it could boost their privacy a bit? Not to mention security from malware blocking. Is there any reason to keep it as is any not switch to Quad9?

Would using Quad9 ontop of Mullvad make me more fingerprintable or anything, since I am sticking out more?

2

>ISP provided

That’s reason #1 right there.

Something to know is that if your VPN sets your DNS, and a device like your router also picks a DNS, if there’s a mis-match, it can make it very obvious you’re on a VPN to services that dislike VPNs.