The only reason cash has significant non-criminal usage is that it has had time to gain a foothold in society.
If all communication apps had a backdoor for government surveillance, and one was introduced with E2E encryption, at first, criminals would disproportionaly flock to it, and you could very well argue for it to be banned under the principle you espouse. Thus you would strangle every privacy solution in its cradle before it has had a chance to become mainstream.
If all communication apps had a backdoor for government surveillance, and one was introduced with E2E encryption, at first, criminals would disproportionaly flock to it, and you could very well argue for it to be banned under the principle you espouse. Thus you would strangle every privacy solution in its cradle before it has had a chance to become mainstream.