Me too, my Android / Samsung phone has a "Private DNS"[1] setting where I specify my NextDNS instead of using their mobile app.

[1] https://news.ycombinator.com/item?id=28365321

For those who prefer Pi-Hole, I set up a VPN server on my PfSense so my devices can use the DNS server in my home network when I'm out. The fact that traffic is encrypted is a nice bonus.

I do this on a symmetrical 500Mbit fiber line, YMMV.

Sounds good, are they selling your queries?

Don't think they are, but if you're after privacy, of course it isn't strictly better than self-hosting AdGuard Home or Pi-Hole.

As one ex, not me but some may be uncomfortable with their use of BigCloud (AWS/GCP/Cloudflare) infrastructure.