I don't think the person you were responding to argued that removing those hurdles would create the most active business creation in the world. Enabling successful business creation is a worthy goal, one I think you'd agree France does accomplish. Not being the superlative isn't the same as failure.

I think there are many other factors that effect this, including the culture itself. I just don't think France has the same culture of entrepreneurship that the US does. Places like Germany or Taiwan are probably better examples.

Right, because for it to be true that fear of losing health insurance is a barrier to starting one's own business, it must be true that it's the only factor at play here.

There is UBI in France? How one is protected from loosing the income there? Let's say I give nice warm and fuzzy F-U to my boss and quit. Where do I get money then?

If you're over 25 with no income, you're eligible for the RSA (~500€/month). Healthcare is free if you don't have any income.

If you had place to live in then it'll be like paradise but I suspect that one will be living in the street on that €500 right?

Why France in particular? Sweden is consistently rated one of the top countries to start a business and they have universal healthcare