Out of curiosity, how hard is it to get a visa to start a startup in France as a US citizen? I've toyed with the idea of starting something in Paris. There app

Out of curiosity, how hard is it to get a visa to start a startup in France as a US citizen? I've toyed with the idea of starting something in Paris. There appears to be ample opportunity even if all you want to do is create a French version of some other successful product.