I feel like this is what Automattic is doing with the WordPress.com Reader and Tumblr. The proposed indieweb version is Microsub https://indieweb.org/Microsub, of which there are some working examples.
I’d love to see another Known hosting provider pop up, as well as more development on the project. I want something that works well and gets out of the way, too.
Chris Aldrichto make some Indieweb memes.