Streaming services never have been and never will never be an 'archive' of any kind. Companies will yank things you love from streaming services, regardless of popularity, on a whim. You gotta own whatever you can.
Luckily, we also now have things like the amazing @internetarchive that we can search through-- all the millions of things they've preserved at https://archive.org. And we can add to it ourselves, too.
All in the name of preservation.