It shows the USA that the people care enough about this specific issue to spend their money elsewhere.
The issue of mega corporations is completely separate of the issue of the USA. It would be best to deal with both, but it’s better to deal with one than to do nothing at all.
What does achieve switching from USA mega corporations to EU mega corporations? Ditch corporations for good and stop eating fast food.
It shows the USA that the people care enough about this specific issue to spend their money elsewhere.
The issue of mega corporations is completely separate of the issue of the USA. It would be best to deal with both, but it’s better to deal with one than to do nothing at all.
If you live in sud america you are doing more good buying a pair of handcrafted boots from USA than h&m boots imported from china.