1) There is no such thing as illegal leverage. Leverage is governed by the exchanges and the clearing firms.
2) Prop firms require "licensed" traders. Retail brokers do not. THAT is the difference.
3) Regulation costs are less. But it has nothing to do with leverage. The yearly audit expenses most professional firms have to go through today make it cost prohibitive to run a prop firm. So some firms are going offshore. I would avoid those.
4) US citizens bring US regulations with them and that means US regulation costs. It's all about economics.
2) Prop firms require "licensed" traders. Retail brokers do not. THAT is the difference.
3) Regulation costs are less. But it has nothing to do with leverage. The yearly audit expenses most professional firms have to go through today make it cost prohibitive to run a prop firm. So some firms are going offshore. I would avoid those.
4) US citizens bring US regulations with them and that means US regulation costs. It's all about economics.