What happens to the business when it isn't small anymore? What does that accountability even look like? Paperwork isn't accountability.
I agree that details can be worked out and systems can be made better, and the government is corrupt (especially now, but also the past two decades I've been old enough to be politically conscious), but I don't think ideological free market libertarianism is the right path to get there. I think there is a lot of merit to a free market and I agree people deserve their own autonomy to not be ruled over, but right now corporations hold way too much power and wealth inequality is too large and only accelerating for me to accept libertarianism as a solution to modern society.
I think another issue is the word libertarianism can easily mean so many different things. There are anarchist libertarians on the left and right, with social libertarians and market libertarians taking up the space between anarchists, and between the four of them there is no solidarity because they all want different things regarding the structure of society.