Sure, but decentralized search? Not many offers that, at even less of them still exists today.
> Bitcoin easily beat them all.
I'm sorry but what? Do you even know what Bitcoin is? How would Bitcoin help me search and download files today?
And why would the centralised or decentralised nature of the search affect user behaviour?
Same thing happened with TPB a couple of times, but amazingly it's still standing. We can only hope it remains so, but in the future we might not be as lucky. Not to say that plenty countries block access to TPB via having the ISPs block DNS/IP to known addresses.
All of these things wouldn't have been a problem if the search index was also decentralized.
Then you claim that since BitTorrent is more popular than eMule, that means "decentralized X" doesn't work.
How is it relevant what would drive the user behavior?
15 years ago, when I was using eMule, I made the switch to Torrent because Torrent was way faster for me. That's all.
A quick search some months back showed there were still some of them available (via a tag I used) which was a pretty fun discovery considering they're almost 20 years old.