I don't see how libertarian can ever be well defined when it seemingly is always based in ideology and the arguments supporting it always seem to be fallacious.
I totally just made that up, so I'm sure we could work out details and make it better, but the overall point of minimizing government power and distributing it could be preserved as much as possible.
No system is going to be perfect, but there is so much more we could do to take power, and therefore the temptation of corruption, away from the people we allow to rule over us. Giving fallible human individuals more power is never the right solution.
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.
Sure, there are different ideas about how to implement libertarianism but the general idea is singular: Maximize individual liberty and private property rights.
Accountability always comes down to individual liberty. The question isn't, "is the corporation too big?" The question is, "is it taking away personal property or individual liberty?"
The absolute hardest part of libertarianism that all of you opponents miss is that it requires people to always be evaluating that in their choices. It requires people to avoid making everything Someone Else's Problem and wishing for Government to Just Take Care of It. People complain that corporations are too big or people are starving or I don't like what my neighbor is doing with their yard and libertarians answer with, "well, you're going to have to do something about that yourself instead of giving up rights and liberty so that someone else can try and force a fix down all our throats." It just blows people's minds! You mean I have give to the poor myself of my own free will? I have to talk to my neighbor about this myself? I need to stop giving that big evil corporation my money of my own accord? If I want more people to do these same things I have to gently persuade them instead of asking the police to just shoot them if they don't comply? The horrors!!