That said.... Gnutella/Gnutella2, eDonkey2000, and others were objectively crappy designs, but still worked very well at one use case: distributing rare files. The thing is, if you have a stable high-speed mirror, the files aren't rare anymore. Hence the only files that are rare are the illegal ones, or ones that can't find a mirror to host them. There's just not much point to P2P. Sometimes there's good reason to distribute illegal files, like getting past state censorship. But the whole world isn't going to adopt a wonky solution for a rare use-case. Hence P2P has not & will not take off.
It seems like we still have decentralized systems but now call them fediverse, distributed, decentralized, federated, ipfs, web 3.0, etc..
It might have been interesting if he'd looked at searches for those terms as well.
Ability to trade for fiat currency proved to be a mixed blessing at best, and a downfall at worst, of this approach. When a system is so lucrative as a vehicle for ponzi schemes, it inevitably gets hijacked, and becomes unable to serve its declared purpose.
I think the term has just faded from the hype cycle.
The application concept is difficult to explain so I have started calling it an operating system as the application is getting larger.