I honestly think mobile ads in free games and other apps are some of the lowest quality piles of garbage I've ever had the misfortune to see, and they are constant. How did we get to this point? Where they are so horribly unbearable and yet so commonplace?
Yea I've considered that but I'm afraid of opening up anything on my local network to the outside. I'm not sure I'm technical enough to risk accidentally opening something that's a vector for attacks. I'm ok with everything only accessible from 192 I'm not out enough for it to matter too much.
Investigate tailscale, run your phone's internet thru your pihole when you're out and about, or set your phone's dns to dns.adguard-dns.com. No-one should have to live with that crap.