See this post that talks about how hosting email yourself doesn't really work anymore, despite it being an open internet standard --
https://news.ycombinator.com/item?id=32715437Not sure about people never hearing about them, but the internet is no longer a network of sparsely distributed connected machines hosting and consuming content as it was originally designed. The content is all hosted on very small set of networks controlled by just a few companies -- Amazon AWS, Google, MS Azure, etc. The consumers access the internet through clients that are also controlled by these companies, and so it's easy for them to exclude other networks and hosts even though the network specification is technically "open".