It also can be copied over the internet by a malicious sw, unlike physical money. There are multiple efforts from different groups/companies developing hardwar

It also can be copied over the internet by a malicious sw, unlike physical money. There are multiple efforts from different groups/companies developing hardware wallets to precisely reduce this risk (think tamper-proof chips storing your coins). This format would still allow backups to exist (eg. saving coins in a 2nd identical chip, or saving the "seed" generating private addresses externally, for example on paper if you want to mimic the security feature of physical money).