Wow someone sure lost his ever loving mind over having an unpopular opinion about youtube-dl.
I personally haven't used it that much, but when I did I was glad it was there. Last time I used it was when I flew to Canada and downloaded a few videos to watch on the plane there.
Did it cause those people to lose ad revenue? Yeah, but they're not getting any at my house anyway with a pi-hole and ad block.
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!