DHH has a large following, so do many people in this network. His blog posts are often discussed here, it's not really surprising that it gets attention and you don't need secret astroturfing or sneaky marketing if people just share / interact with it themselves organically.
They just announced the new "Omacom foundation" last Friday, with $8 million of funding from prominent tech people. That's why it's getting current flurry of attention
It's been showing up all over YT for a while if you do any searches for Linux.
I took a look at it when I kept seeing it, realised what it is and who it's by and carried on moving, putting aside DHH as a person, it doesn't really do anything I want or in a way I'd care about but then I'm also not the target demographic/user, after 30 years of using Linux, I don't need it.
Just hype, it's Kagi all over again. People said the same thing there, we're just too cynical, not used to people getting excited about really cool stuff anymore.