Blockchain is nothing but a simple protocol just like the TCIP network protocol, yet it has been made into an instrument of "awe" by likes of ELON Musk and many others who have no clue about the block chain concept itself.
The speculative part of blockchain ie Bitcoin and Etherium are simiart of Horse racing, Poker, Arts painting collection. They have no value to society but still exists as a means of rich and speculators wet dream