This isn't that much different from the rate at which stuff comes up in my modest set of Youtube subscriptions. And what of that stuff is worth a rewatch or considered culturally significant? And yet! 100 years from now they'll lament that so much of today's pop culture has simply been lost to random deletion or bit rot.
I have yet to see a definitive answer re true originals being kept vs iterations of transcodes as the preferred codec changes.
Or similar questions about deleted videos getting flagged vs scrubbed, etc.
Or who might ever have access to originals in either case.
It actually seems better from when I last looked at it, but you can you still hear skipping and audio jitter around spots like at 0:18. I've seen similar behavior on Twitter video uploads over the last few years.
I'll intentionally duplicate playlist entries (two different uploaders) as a buffer against rot.
In some cases you won't know until decades later, when one of those videos becomes "lost media" and people start looking for it.
That's why, as long as people are willing to buy hard drives to store everything, we should let them save as much as they want for the future. Because you never know.
Otherwise, there is too much content for anyone to view.