[Nullabillity]

There's also AdAway, which runs on any rooted Android phone, and doesn't require you to show all your traffic to a particular DNS server.

[cyberpip]

There is also Blokada, which creates a local VPN on Android and runs it against a hosts file: https://f-droid.org/en/packages/org.blokada.alarm/ .

[jsmith99]

The advantage of Knox based blocking is that it doesn't require root.