Your currency could evaporate because the price of the asset was fine, but your broker ran away with the money. Or, the hardware wallets etc are the best/safest alternative, assuming, of course, you never make a mistake when doing X, Y, Z...

Kickstarter had a reputation for fun creative projects that people wanted to exist. And many failed due to poor management, planning, etc..

"Crypto" has a reputation for recreating things nobody wanted but "on the blockchain", projects that costs hundreds or thousands of dollars for almost no value proposition beyond "it's a great investment! Trust me!" The few that weren't rugpulls were still asset flips or ponzi schemes or otherwise still negative-value-added over their non-blochain competitors.

I think it's worse than that - as far as I can see it's only moves wealth from one pocket to another. Usually many pockets to few pockets. I've not heard of how it's increasing labor efficiency or enabling completely new capabilities for anyone, with maybe a few minor exceptions. So its really a pretty successful parasite.

Generator of wealth for whom?

Sure, just like cocaine.

Not at all, it's largely grift-based wealth which by definition means there are more losers than winners