Fediverse

As a long-time cryptocurrency observer, it is going to be very amusing (in a bitter sort of way) seeing everyone discovering that they're trying to solve the same problems that cryptocurrencies have been working on solving for over a decade now. And then finding all sorts of ways to contort themselves into solving them differently from how cryptocurrencies did it so that nobody can accuse them of being "crypto bros" or whatever, even though the technology is perfectly applicable as-is.