I gave up ~2021. Bought one of the 10tb 5200rpm disks and just started yt-dlping entire channels when I found something good. With mixed 360p/480p/720p backups, I've used ~1/5th of the disc across nearly 50,000 files.

This does make me the unethical bad-guy, but my aversion to advertisement is so strong that I can't feel any remorse. AdSense is a scourge on the internet, and once Google is held accountable for it they'll immediately try to extort their licensed library of millions of videos to make a living. And they'll have to try a lot harder than that if they want to deprive me of a daily Tom Scott video with my morning coffee.