Is there a specific article you can share on the details?
I do like users owning their own data, of course. I know Nostr has some privacy issues, but I assume affixing things to a private key can be workable.
My guess is the market would be smallish for a while. If people are dying of cancer they care less about privacy and more about treatment. And people I know who are health-hackers tend to like to broadcast their metrics most of the time, if anything, or otherwise aren’t way into privacy.
So I like the option. I think marketing with a focus on self-ownership is hard.