globally trivial

Please share your trivial solution then.

Multicast wouldn’t really replace any of the sites you mention because people want and are used to on-demand curated content.

It’s also not as practical as you make it sound to implement it for the entire internet. You claim that this would be efficient because you only have to send the packets out once regardless of the number of subscribers. But how would the packets be routed to your subscribers? Does every networking device on the internet hold a list of all subscriptions to correctly route the packets? Or would you blindly flood the entire internet with these packets?

Political views as they are, it’s gotten a lot of pushback

Yeah, the comment above mixed up grammar nazis with actual nazis I guess.