He also said Bitcoin mining is harmful because of its excessive energy use. "Bitcoin uses more electricity per transaction than any other method known to mankind. If it’s green electricity and it’s not crowding out other uses, eventually, you know, maybe that’s okay. I don’t see the topic as deeply related even though you might label me a Bitcoin skeptic," he stated.
However, he hinted that his foundation is currently developing its own digital currencies that have "ultra-low" transaction fees.