The solution for YouTube is right in your comment: it used to be the case that only tech savvy people would install AdBlock.
With more ads though, the incentive to install an ad blocker is suddenly there for more, even not so tech savvy people.
YouTube‘s reaction is already visible as they are now trying to block ad blockers: Try to make it more difficult to get an ad blocker at all, so not as tech savvy people won’t get one and continue to watch ads as they used to.

This are only open source patches to the proprietary client.

That would also be my go-to solution, except she wants hundreds of movies (in which case Plex also makes sense, but more for her than for OP).

I have been using a PineTime for quite a while now which is an absolute no-brainer for 27$.
Even if it’s marketed for tech/foss enthusiasts it’s really easy to use, would recommend if you just want simple step tracking and heart rate monitoring.

came to find this

Interesting, what was the topic of the video? And what did he say?