@Knittinggrace simple: there are none. Obeying the government is probably the official reason. But in the end, this might be the chain of thought: no church-building attendees, no moneymaking, no salaries, no modern church-system,
It would all fall apart and we would meet in houses outside of control of leaders and would start to read the Bible for ourselves and there would be only one shepherd, one flock...

Oh boy, I'm dreaming again...