God damn - I had this idea myself! Great minds think alike, but fools seldom differ.

I was thinking of an additional step of having it transcode overnight to a more mobile phone friendly resolution, like let’s say 480p, as well as introducing a time to live (TTL) so that I don’t end up with an ever expanding YouTube library that never gets watched.

Actually I seem to recall there was a YouTube something (Youtube custodian? Something like that) that did all this for you directly. But I think I would like to try doing it as a cron job because it could run on low end hardware like a Raspberry Pi.