A detail that I want to comment is that the technology to decrypt advances at the same rate as that of encryption (although sometimes it seems to me that the latter is faster), so if you develop a quantum decryption, surely there will also be a procedure of the same caliber to encrypt and protect information.

As for consumption, because I consider it a valid concern for the ecological aspects of this technology, but it happens that I have never been able to find reliable data on how much energy traditional financial communication systems and data servers in stock exchanges consume and other related things. Without data you cannot compare and know which is worse.

In this I have to say that I am happy when I hear of initiatives to use renewable, clean and sustainable energy for the Bitcoin blockchain and other cryptocurrencies. I think I heard some of that in a project in Paraguay, which involves the use of hydroelectric power plants