Back in the day, I had been subscribed to so many YouTube channels that they didn't have the functionality to show me all of the new videos.
I'm also seriously annoyed with having videos and channels "go missing" because of takedowns, bannings and closures. YouTube doesn't even give you the author or name of a video when it's removed.
The solution was to locally cache at least the basics of the information. If I had my way, all of the videos would be downloaded too, but that's too extreme even for me. I also think my ISP would have a fit.
Getting this information can be done via RSS.. at least while YouTube still supports such a thing. My last experiences with RSS and YouTube are found in rss2email, and a rant on usability-apathy.
This list is incomplete. I have more notes elsewhere I'll eventually put up here, including if the channel owner just renamed or if there's a known reason for their closure.
I may also have mixed in some channels which are not actually atheist. I have no way of knowing that, since I only have the names and a very bad memory. Oh well.
-  terminated due to repeated or severe violations of our Community Guidelines and/or claims of copyright infringement.
 terminated because we received multiple third-party notifications of copyright infringement from claimants
- or: terminated because we received multiple third-party claims of copyright infringement regarding material the user posted.