I'm also in the Pihole gang. Sometimes, using an app outside of my home network reminds me, that I should buy the add free version, because I use it all the time..
I don't care too much, if an app or website shows some ads. Butin general they are designed as nuisance or trap. And I don't like that.
On my work machine I use ublock origin, since for some reason my work does not block ads on network level.