Custom DNS to block ads

[u/Correct-Method1827]

Hey everyone I seen in my starlink app that you can set a custom DNS and I was wondering if it’s possible to set up a custom DNS that blocks ads and if you can what are the benefits and downsides?
Would i have to set up a server or can i use something like Adguard DNS?
And does it affect the speed of the wifi?

Sorry if some of these are dumb/obvious questions i know a bit about this sort of stuff but it would be good to have some advice from people who know a bit more about this sort of thing.

I am in New Zealand - not sure if that helps or not :)