https://en.wikipedia.org/wiki/Advogato tried something pretty similar and ultimately died.

Arguably Twitter with non-algorithmic timeline and a bit of judicious blocking worked really well for this, but even that's on the way out now.

> Any time you publish anything, you're signing that publication with a key that only you hold.

People could in theory have done this at any time in the PGP era, but never bothered. I'm not convinced the incentives work, especially once you bring money in.