It's better that the Popcorn Time developers leave now than later. By leaving now they can take advantage of all the attention and get a great fork going.
1) Build something incredible.
2) Get a ton of cred for it.
3) Release it to the masses via open source.
4) Wait for the lawyers to roll up en masse.
Then simply flee the scene, avoiding any legal entanglements and with steadfast assurances what you've created will now go on without you, and most likely morph into something even more incredible.
Genius I tell you, genius.
It is wonderful how the Internet makes it hard to suppress information.