Bitcoin core developer: Energy consumption is the power to limit the number of bitcoins to 21 million

On October 17, Bitcoin core developer Jimmy Song said on Twitter that "energy consumption is the power to limit the number of bitcoins to 21 million. The lack of actual cost allows the legal currency to be issued indefinitely. You can have hard-to-get, Scarce currencies can also have easy-to-obtain currencies; but scarce currencies that are readily available do not exist."