Don’t see why, if anything more people should know about it so shared content can become more redundant as people download it across the world. YouTube is a fairly brittle hub sometimes with all the takedowns.
This scares me a bit too, I watch basically all Youtube content via Youtube-dl. I have a script that runs every night on Mac, so that new content automagically appears in my Movies folder.
Fair warning, it’s quite macOS specific.
You could argue this is bad because it bypasses the distro release system, but then, Youtube also updates itself without the distro's approval, so the software that interfaces with it must as well.
Same thing happens with the newpipe android app which somehow manages to be far superior to Google's official YouTube app.
What needs to stay under the radar are the dozens of downloader sites and GUI apps that offer the same functionality and ten times the convenience.
Yes that's right, clicking 15 times for every single file is easier than having a script automatically download a series. ;)