Maybe that's because they are of a different opinion?

If we proceed from the assumption (which looks more like a fact to me) that all cryptocurrencies apart from Dogecoin, to a certain degree (yeah, you read it right, Dogecoin), are a zero-sum game, you increasing you wellbeing via Bitcoin comes at a cost, more specifically at someone else's cost or expense

Which means the net effect for the economy is not necessarily good or positive overall since if there are winners like you and those like you, there should also be losers, a sine qua non for a zero-sum game. And for them cryptocurrencies might have been quite a disaster. This is the other, not so bright side of the crypto economy