How do you avoid ads when watching YouTube on a phone?
On Android there's plenty of choice. NewPipe is a dream[1]. Firefox with uBlock Origin works well. There's Kiwi (Chromium) with uBlock Origin too.
How hard would it be to implement an ad blocker browser extention to do it? Query an api endpoint with a video ID to find out start and end times for the ad and automatically skip over it. Allow users to volunteer to submit those ad times to build up the database. It would be limited to browsers, but it would still be something.