[mannykannot]

And tulips are still being bought and sold. Bubbles tend to have a life of their own, regardless of the MacGuffin they are organized around.

https://en.wikipedia.org/wiki/MacGuffin

I don't know about cryptocurrencies in general, but ICOs seem to me to be mostly foam.

[dnautics]

Bubbles also tend to be driven by leveraged investment. See kindleberger.