Comment by joseda-hg

As mentioned on another comment, yt-dlp works, Depending on how deep you want to go, there's a lot to grab

Telegram, Discord and assorted communities do a lot for keeping some semblance of "stashing" alive

Also there's Whisparr

The "weird" part of it (And why I believe a lot of people don't think about it at first) is the amount of forethought that this involves "The algorithm" plays a significantly larger part on sites where it's considered a faux pas to have an account, and actively curating a collection is considered creepy, unlike with music