Of course popular feeds are crawled constantly, and no, there’s no “telling some users that a popular feed has new entries and not telling the free tier”. But y

Of course popular feeds are crawled constantly, and no, there’s no “telling some users that a popular feed has new entries and not telling the free tier”. But you bet services don’t want to crawl those one-subscriber feeds (e.g. some websites have personal feeds for paid subscribers) constantly for free. And RSS Box feeds apparently tend to fall in the latter category.