I lived through the dot-com bubble and burst. It was a massive overinvestment during a hysterical cyber gold rush ushered in by internet technology that was certain to revolutionize society.
This bubble is just so stupid. It is completely driven by FOMO and incompetence around a technology that nobody wants, puts massive strain on energy and natural resources, and is already exhibiting scaling issues. All they have left is to yap about billion-this, billion-that.