It’s not an ad blocker in the way you expect something like uBlock to work, if that’s what you’re asking. Get Pihole or AdGuard on your network and use that. VPN when mobile if you’re super paranoid.

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Check out nextdns or quad9. Though, on mobile, I would look into using a vpn like mullvad or protonvpn, they have malware and ad blocking built in too. I prefer this method because I use school wifi a lot and they force their google dns on the phone so I can’t use nextdns or quad9, vpn will get around that and filter your traffic.

Use NextDNS with this guide:

https://github.com/yokoffing/NextDNS-Config

Haven’t had anything broken :)

I use NextDNS, which others have mentioned here.
But Mullvad also has public DNS (DoH and DoT only).

Look into next dns maybe

It’s okay, but I’d personally recommend NextDNS more. Quad9 is also good, but more basic.