[chalupaman]

For me, the issue is that overwhelmingly the sponsor blocks are for products and services not available in or relevant to my country. Unlike the regular ads loaded through YouTube, they can’t be customized based on the viewer’s region. They will just assume that viewers of English-language content are in the USA, mostly. When you subtract mobile games, which I don’t play, I would say that maybe 1 in 20 of them are things I could buy even if I wanted to. So it just feels pointless, they see no benefit from my seeing the sponsorships and it wastes my time.

As for what sponsored content people are streaming: where I live Internet providers provide unlimited bandwidth during off peak hours (midnight to 8AM) but give you a monthly data limit outside those hours. If you are in an area not wired for high-speed internet, you might be relying on 4G which can have a monthly limit of as little as 50 GB… which isn’t much at all for a family. So it’s nice to be able to queue up all the videos you want to watch to download overnight, making the answer “everything/anything.”

(And that is the chief use of YouTube-DL for me. YouTube premium lets you save videos to watch offline, but only on mobile devices —- which typically have little storage for them —- and you can’t schedule it, you’d have to get up at midnight to manually select each video. With YouTube-DL I can schedule downloads of all my subscriptions and bookmarks to a nice big hard drive and then automatically put my PC to sleep.)