Focusing on bitcoin, as an investment asset (a means of rapid growth of value), many overlook its true value, thanks to which its price on the exchanges is growing.  This value is a unique ability to save and transfer costs over distances without the involvement of a trusted intermediary.
  In this sense, Bitcoin has advantages both before the issued by states with fiat money, and before gold.
  Bitcoin exists outside of state institutions and does not need state regulation.  This is a completely self-contained system.
  Bitcoin also does not need legalization.  Being outside the legal field does not mean illegality.
  Undoubtedly, Bitcoin, by virtue of its special properties, mentioned above, is an attractive object for investment.  But, not this is its main function and mission.  Bitcoin came to this world to destroy the state monopoly on money and their circulation.  And to create a new monetary paradigm - henceforth the transfer of value is possible without intermediaries, as in cash calculation - from hand to hand.  Without central banks and other financial institutions.  Without uncontrolled money issue and inflation.
  Therefore, bitcoin was a valuable currency, there is and always will be!