Maybe there is a third group: Believes that are some uses with cryptocurrencies, but most of the space is over-hyped, but that doesn't mean everything is vaporware, and someone who doesn't care about the money earned by working in it but rather that it replaces money as we know it today.
Furthermore I'm not even going to bother sending them this paper because I know that most of them rarely read anything longer than a Tweet.
I'm not entirely sure either (and I didn't, for the record) but I could imagine why people would. Grouping a huge industry into just two groups generally is seen as over-simplification, and I would agree with that. There are clearly people working in the space that don't fit in in either groups.
If your only goal is to persuade people who have no interest in utilizing reason, or to dazzle people who already agree with you with your rhetorical skills, then sure, there’s not much point. But if you actually want to utilize reason yourself and construct or refine a rational argument, that’s certainly not futile.