But the US also limits their patronage of other businesses whose owners shop at the store. And because the US is such a rich and great customer, while Cuba is broke and their shop has empty shelves, other business owners generally avoid going to CubaMart.

It's not a blockade, and everyone involved is simply exercising their sovereign rights. But it is mildly coercive. Which, obviously, is the whole point.

Right, but the point is, it's not a blockade. Loads of people are calling it a blockade, and correcting that piece of misinformation is the root of this whole thread.

If people want to say that the embargo is coercive and bad, that's fine.