It's an odd page that doesn't offer any solutions or calls to action... But "own your platform" is basically the principle of Mastodon [1], where you don't have to sacrifice the idea of "reach" because all individually hosted Mastodon servers are interoperable, so you can get followers and go viral all across the network.
It's probably an alpha stage project that's in the feedback gathering phase. Given who's behind it, I fully expect this to become a fully "productized" thing later, replete with newsletter/ebook popups and some SaaS offering.
[1]: https://joinmastodon.org