You can actually block in-app advertising on Android with apps that block DNS servers. These apps aren't on Google Play because they violate the TOS, so you'll

You can actually block in-app advertising on Android with apps that block DNS servers. These apps aren't on Google Play because they violate the TOS, so you'll find them with all of the wonderful open source Android apps that violate Google Play's TOS in the F-droid repository. DNS66 (Block ads/hosts via DNS) - https://f-droid.org/app/org.jak_linux.dns66 https://f-droid.org/app/org.jak_linux.dns66