I said this in another comment on this post, but check out ENS. I’ve been a blockchain skeptic for a long time (and still am about art NFTs and most other things) but the idea of “SSO without a company attached” feels like something the mainstream public actually does want (think of all the negative public sentiment around big tech companies harvesting data and the grudging acceptance people have of their dependence on FB and Google for identity and easy sign-in). It’s also something that requires blockchain and can’t be done without a “decentralized consensus” about who owns what username (this is how you get around relying on a particular company). And ENS works now, it’s the kind of thing you could just go ahead and add to a web app you’re working on without having to wait for “the tech to arrive” or anything.

Again, I’m still skeptical about most of this stuff, but this one thing seems like a pretty good and somewhat practical idea.