> The key question is what happens if you break those laws. In most cases you will be given a fine, and if you don't pay then you will no longer be allowed to sell goods to consumers in that country. If you continue to break the law then you are probably breaking an international treaty on border control or customs, which means that you could be extradited or tried in your own country. Some of the laws I mentioned above are mediated through international agreements, but the fundamental point is that if you break their laws they can place sanctions against you to stop you from doing business with them.

A foreign country could arbitrarily decide I owed them a certain fine, or was no longer allowed into their country, or that they didn't want to allow my products into their country, at any time, whether or not I followed their laws.

In my daily life I've done, and continue to do, things that are illegal under e.g. Iranian law. That's fine and normal - I have no obligation to comply with Iranian law. Iran can make its own decisions about whether e.g. I'm allowed to enter their country, but that would always be the case.