Fascism is not Nazism, but Nazism is a flavour of fascism.

I do understand what you mean and historically you’re absolutely right, it has always devolved into fascism. I don’t think you can name a system of government that hasn’t either started there or ended up there. But that was a process, capitalism isn’t written that way on paper at all. The tenets don’t line up. Like how communism in practice has very little to do with fascism (the managed economy bits often look similar on paper, though).