Probably what their initial intention was from the beginning.

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.