> But then millions of users have still to potentially pull the data from the feedreader, because they can't implement WebSub This is worth pointing out direct

> But then millions of users have still to potentially pull the data from the feedreader, because they can't implement WebSub This is worth pointing out directly: Yes, of course. You always do have to transmit the data to the actual reader. But those are users of the feedreader, they do not contact the source at all. The advantage of this scheme is that data is transported exactly as often as necessary and as fast as possible, unlike when data is polled. It has no relation to a CDN I see. A CDN would mean the source has not to handle the incoming traffic, or less of it, but a CDN does not enable push nor reduces it the traffic between CDN and feedreader server.