It's pretty basic to implement some kind of token scheme for the feed to bypass the paywall. It happens all the time for paid podcast feeds. If you see large n

It's pretty basic to implement some kind of token scheme for the feed to bypass the paywall. It happens all the time for paid podcast feeds. If you see large numbers of geographically dispersed feeds you can then look up who shared their key and have a word... Skeptically I belive most sites just don't want to supply RSS/atom feeds as it bypasses their ability to track and advertise to you and having something like needing to deal with auth is a convenient excuse.