If it is the government then it goes back to the people being aware of their interests and not allowing themselves to be manipulated. Which is never going to be the case.
The answer to this question has always been ideology. Establishing a deep an sincere belief in the purpose of an undertaking on the part of its functionaries is the most durable way to run a community of any sort.
Successful anarchist programs require some degree of ideological commitment to a greater cause. Switzerland is probably the most decentralized society on earth and you will notice the incredibly tight sense of right/wrong throughout Swiss society.
In theory the regulators, as part of the government, serve the will of the people. But the state under capitalism serves no one but the massive corporations which these regulators are meant to govern. So we end up with fossil fuel guys running the EPA and Verizon lawyers running the FCC.
There is no one to regulate the regulators because the state in its entirety is isolated from accountability to the public.