It’s wonderful but can be less complete or even missing typically due to settings (e.g., security), the environment (e.g., a container), or both.

1.1.1.1 does no filtering. 9.9.9.9 does, similar to 1.1.1.2. To skip filtering use 9.9.9.10.

Privacy Browser

I expect they think that a significant percentage of people that have Internet also have a smartphone. They probably aren’t far wrong.

Your OS might be killing (outright or effectively) your app - check dontkillmyapp.com for possible solutions. Or the app doesn’t have notifications enabled at the app and system level.