>RSS feed can't limit only to subscribers. Authenticated rss feeds are a thing. I have subscribed to some premium podcasts which have a auth token in the feed

>RSS feed can't limit only to subscribers. Authenticated rss feeds are a thing. I have subscribed to some premium podcasts which have a auth token in the feed url for authentication. This allows paid content, and most importantly revocation of access at a later date (if e.g. the subscription is cancelled).