There's the usual fact that the more extreme or fundamentalist someone's viewpoint is, the more like they seem to want to yell it (and the easier it is to say it, concisely). With cryptocurrency, I think that there are many people with a financial and/or political stake in it, who argue from a technical perspective about the merits, so the usual-moderate person senses this disingenuousness and, annoyed, responds more negatively than they usually would. So, in other words, the same dynamics that drive polarization on contentious political issues apply (and I'd actually argue that cryptocurrency is more of a political issue than a technical one).

The problem with crypto is the same problem as always. Bad humans come along and destroy what could have been a good thing in an attempt to fill their bottomless empty pit of greed at the expense of everyone and everything else. Happens every time any human(s) try to create something that's meant to be beneficial for everyone - along come a few scammy ass-hats who decide they're gonna ruin it for everyone (by weaponizing it, turning it into a scam, or what-have-you), and inevitably a whole bunch more scammy ass-hats always gotta jump on that same bandwagon, increasing the momentum of the downfall. Yay, humans!

Couldn't it have something to do with flawed fundamentals?

And the people who criticize crypto don't really understand why would you use crypto.

They have a stable government, a stable currency, a free Democratic system, they see no reason to use crypto because they have never lived in a sanctioned or very corrupt country with no freedom and Dependant on a financial system and a mother countries decisions without any influence over them.

These people are only about 15% of the world, you are lucky if you are born or living there.

I think this video explains it very well, from a north Korean citizens point of view, even though I don't agree that BTC is good for this, its similar to digital gold now, its vrry inefficient almost no one uses it IRL.

https://www.youtube.com/watch?v=cR4sMsI8z7U

The current marketcap of crypto is made up of people in the first world investing.

I don't want to be a dick but if you live in Venezuela or North Korea you are irrelevant to the world economy. There is a Dutch saying "wie betaalt bepaalt".

What the poster is saying is that cryptocurrency is relevant to them, not that they are "relevant" to the world economy, whatever that means.