The only thing he does is give arguments why bitcoin is no good. And if he points to nice qualities, it is followed with a 'but'.
That is being anti bitcoin.
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I could not disagree more. To me being critical is being pro-{whatever}, or is at least a strong part of it. This means that one has taken enough of an interest to study and consider all aspects of the something. I've got no use for slavish fan-boys of anything. I consider some of the harshest critics of the U.S. to be the biggest patriots, for instance.