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Re:U.S. Regulators to Subpoena Crypto Exchange Bitfinex, Tether by jandrese on Tuesday January 30, 2018 @09:58PM (#16270971)
It has diminishing returns on the amount of work you get out of each hash, so if you wanted to support millions or billions of transactions per second (world scale) it would become impossible to sustain.
Re:U.S. Regulators to Subpoena Crypto Exchange Bitfinex, Tether by politician on Wednesday January 31, 2018 @12:07PM (#16275381)
There's also the problem that the block size is capped which is maybe what you were referring to?