Sorry if this is an aside, but I mean... practically speaking, wouldn't a ban on encryption basically be useful and impossible to enforce? The US export control

Sorry if this is an aside, but I mean... practically speaking, wouldn't a ban on encryption basically be useful and impossible to enforce? The US export controls on encryption in the 1990s were largely ineffective, no? Forcing Apple/Microsoft to build in backdoors in their implementations of encryption packages might be one thing, but software developers surely have local copies of openssl, libsodium, etc, so what will this actually be able to achieve?