Might I highly recommend something like youtube-dl to save those precious videos and playlists locally. You never know when they're going to shut down your account again or go under.
I think they're safe from going under, but do worry about them shutting my account down again by accident.
This is going to sound snarky but here goes ... Sounds like the problem is not wanting to store an admittedly large number of videos but not liking the service of the company doing it for you at no charge.
Average length of time of those videos is around 5 minutes, total size ~135 hours, or ~150-200GB.
I could store a personal mirror, of much larger size for almost nothing, disregarding legality of such, but the data is less important than the references in a large number of cases. I don't care about the content as much as the ideas the references help recall, in most cases.
They're pretty safe from going under now, but what about when the next big breakthrough is at a competitor? Presumably you want to keep your memories past the 5-10 year visibility that technology cycles at.