Possibly the cost of energy to heat the plastic. But at some point that cost is mitigated by the environmental benefit. Many could argue that that point happened some time ago.

The cynic might point to destabilising the oil cartels and the general world economy underpinned by oil.

Funny you bring up patents. It's seems we already live in world fearful of the darn things.

Still, great video, and kudos to the folk who developed it. I really like the fact that the thing is so small and easily portable; killer feature.