I don't think it's possible to create a totally incorruptible system, and who defines sufficiently large is an important problem, but I think it's not a reason

I don't think it's possible to create a totally incorruptible system, and who defines sufficiently large is an important problem, but I think it's not a reason to dismiss the idea. Any regulation is plagued by this question and the specter of regulatory capture. Do you think it's possible to counteract the natural decay of free markets without a [del:'central'] regulatory authority? No, that standard would not apply to a small ISP. The premise is institutions that grow strong enough are able to unduly influence and capture the regulators more easily. Corporations need to be kept small enough to regulate effectively. The existence of "too big to fail" private institutions is a threat to democracy. EDIT: National government, itself an institution, also needs to be kept small enough that it can be contained by the regulators on it, so this is clearly not a simple problem. The issue there (in my opinion) is that the check on national government is supposed to be the states, and they are too weak to do that effectively.