It's a fair point - Google cannot be relied upon to continue providing this kind of open access indefinitely. I noticed my RSS reader hitting those 404s at the

It's a fair point - Google cannot be relied upon to continue providing this kind of open access indefinitely. I noticed my RSS reader hitting those 404s at the time, and I promptly started looking into the Piped / Invidious infrastructure, thinking Google is pulling up the drawbridge (a la Reddit, Twitter, etc). Then YT RSS came back and I stopped, but I really should switch my feeds away from Google anyway.