I cancelled my subscription so not really defending them myself but if all of their customers were humans who used it normally I bet they could serve everyone. It's when someone presses a few keys walks away and a bot uses tokens for 72 hours straight that it becomes a problem. Then people buy 3 accounts and do that for weeks at a time.

Could you do that as a human? Sure but you'd likely burn out after a couple of weeks. Also the human would probably use those tokens far more effectively and would not need as many. It's feels the same as someone installing a crypto miner on their servers in my mind. Abhorrent behavior.