I don’t think that bitcoin is useless and isn’t any fundamental behind it.
Compared to gold，bitcoins also a scarce resource,  its total supply is 21 million.it is a decentralized digital currency without a central bank or single administrator that can be sent from user to user on the peer-to-peer Bitcoin network without the need for intermediaries.
the price of bitcoin will reach or past its historical highs in a few years rather than blow the $4000