The problem is that a foreigner, a traveler, a digital nomad, can not get the code easily. In Greece for example, you have to apply for temporary citizenship, which takes a month, then order a latest shot, be it booster, or second dosage, etc., wait for it, then ask for the QR code, which in total time can take several months. Most travelers do not have that much time to wait.
With many countries attempting to lure digital nomads to their country, this is a big roadblock in doing so. The long lines at testing centers around most towns is growing because people have to go to work, they have to eat, and shop. The one thing good about being a digital nomad is that you have the freedom to select where you live and can do so where the rules and laws do not hinder you from living a good life.
Hopefully a more integrated system will be developed so that those depending on the tourist traffic will not be hurt by imposed restrictions such as this. With so many changes in the law it is so important to follow the countries you want to visit, and make sure you have exit pans in case the laws shift against your movements.
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