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Any new tech will come with a lot of development costs. Oil is an established thing. At best, I would expect a company to wait until someone else comes up with the systems to do things.
It makes sense to keep a competing tech off the market. Stable profits, vs this other guy who has a good invention but will reduce your profits. You could buy the patent, and own the profits, but there's a lot of input money needed to get to that point. And who says you will get more profit from the new system than you do from oil?
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