The same way you prevent free individuals from refusing to be governed..... You can't.
That said, the goal of most anarchism activists is to tear down the common acceptance of the idea that there can be any right to rule over another, as an individual or as a collective, until there are too many who have shaken off the myth of authority for any "voluntarily elected government" to ever enforce their will, on a large scale, on those who do not consent.
The same way you prevent free individuals from refusing to be governed..... You can't.
That said, the goal of most anarchism activists is to tear down the common acceptance of the idea that there can be any right to rule over another, as an individual or as a collective, until there are too many who have shaken off the myth of authority for any "voluntarily elected government" to ever enforce their will, on a large scale, on those who do not consent.