That is definitely not how the world works. Import/Export laws do exist for a reason.
Your edit makes even less sense.
1) a foreign customer buying
2) a foreign company selling
Those two happen at the same time. If I’m in Australia and I’m buying something from the US I am a foreign customer (relative to the company) and the company is also a foreign company (relative to the customer)
If you want to export anything you have to follow the laws of the country you’re exporting to.
Your edit makes even less sense.
1) a foreign customer buying 2) a foreign company selling
Those two happen at the same time. If I’m in Australia and I’m buying something from the US I am a foreign customer (relative to the company) and the company is also a foreign company (relative to the customer)
If you want to export anything you have to follow the laws of the country you’re exporting to.