It can both be true that cryptocurrency is nifty and has real world applications, and is at also widely speculative currently.
1. There are currently useful applications. 2. It currently brings value to some people in one way or another. 3. If there are no killer apps, it's not obvious to a large swath of the population.
I try not to be one who invests too much into the wisdom of the crowd. I also try not to dismiss them either. We can be both clever and easily fooled.
I think crypto posts continue to appear because the idea is sexy, but I also think the parent poster is correct: the realized applications are not.
Crypto captures the imagination, but it's a disappointment in practice.
Give most people want they need and a little of what they want and you'll find most greed driven behaviors largely disappear except for a select few who I'd argue have dysfunctions or lack basic social maturity.
https://www.smithsonianmag.com/smart-news/how-mouse-utopias-...
Interesting concept I learned when I stopped drinking -- you aren't owed a rebuttal when your argument is stupid!