"What happened" to it? You're LOOKING at it, right now!

PeerTube builds on top of the Mastodon / ActivityPub network, which is Decentralized Facebook.

In effect, this is showing the network effect of the new open-source / federated protocol. It can be extended to host videos over Bittorrent over WebRTC through the Web Browser (all port 80, no configuration, Javascript clients only), while publishing over the Mastodon / ActivityPub federation.

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I think there are some legitimate privacy issues with regards to Bittorrent over WebRTC (public publishing of IP Addresses and such), but as long as its a configurable flag that individual servers can turn off, then the federation can grow.

If you're talking about Diaspora, it more or less failed because of some technical decisions made early on, but there was a lot to be learned from their effort.

What you're seeing here is the second wave of stabs at the same concept, after internalising some of Diaspora's lessons.

Nobody moved to it, cause nobody knew anyone on it.

they successfully raised crowdfunding..