@LTU_btc suggests to just accept the QR society and buy a code on the black market.
Well, I didn't said that. My thought is that if governments will make vaccination mandatory, black market for vaccine passpprts will be big. It's difficult to expect that even with mandatory vaccination 100% of people will take vaccine. Even now some are trying to get fake passports.
'Fake passports' are exactly what
'they' want. May work for a quarter or two, but it leads all of society into the trap. Namely, an excuse for biometric ID methods which make cheating impossible, and more importantly, will be the foundation for total monitoring and control of all important biological processes. 99.999% of the population will be literally meat robots and can be selectively experimented on and generally played with, raped, culled, etc, with as much discrimination as is desired.