The last part is why so much money is in it. Everyone remembers how everyone said dot.com was over in 2002 when the biggest dot.coms were yet to come. Everyone remembers when everyone laughed at Tesla and SpaceX. Everyone remembers Bitcoin at $1.
There is a hell of a lot of FOMO around.
There are also record low interest rates not just in the USA but globally, and that is inflating every asset at once.
If there is a crash I don’t think it will just be cryptocurrency. It will be broad and deep.