I can understand the appeal of wanting something like Drivepool, but I don't believe there's anything for Mac like it out there. You can use something like https://romanrm.net/mhddfs which is like mergerfs/unionfs but it's all command line and not sure how well it works. Source: almost 2 years ago

The Third and last piece is Flexget which is an automation tool which will also keep track of things it has already seen. Source: 12 months ago

That’s why I automated all my torrenting. The ads are ridiculous. I use flexget linked to my trakt account. I add something I want to the relevant trakt list and flexget searches various torrent sites, selects a torrent that meets my specifications (quality, size , torrent health), and adds it to my torrent client. I also have it configured to rename files, move them, and clean up my queue after I’ve reached seed... Source: about 1 year ago

To automate this, you could use flexget to check the channels you want periodically and send them to your youtube downloader. Source: almost 2 years ago

FlexGet can be used to download a podcast with it's RSS feed if you're familiar with editing config files. I use it for this. Source: about 3 years ago