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They are partly correct because the cryptospace is full of untested and unused technology and scams.
And full of opportunities!
Depending on your ethics you can get really rich, really fast simply by setting up
a profesionally looking ICO. Even if you have moral constraints that prevent you from doing this
the whole crypto space currently resembles a "gold rush era". There are many early adopters, who bought
BTC or ETH when they were ridiculously cheap.
However, I concede that the unregulated nature of the current cryptocurrency scene begets an
unprecented amount of outright scams, vaporware or simply untested and unused technologies.
If you doubt this simply take a look at all apps based on Ethereum - there is not a single one,
which actually has a non-negligible user base.