Socialism

You jam me and I'll just jam you back.

Exactly. In radio frequency terms, this is the same thing as civil war. And we institute governments in order to prevent that situation.

See for example, the Seattle CHOP/CHAZ which very quickly descended into violence, ultimately ending in an escape to government and police.

members acting as their own enforcement

The point is that this won't work.

Again, the goal is not no government, its reducing down to the minimum required governance and heirarchy to accomplish that goal.

At least in terms of radio spectrum allocation, that's what we have now.

how do we prevent large corporations from ruining things

This is nothing specific to large corporations. I can envision amateur radio operators entering into feuds or disrupting others out of spite or jealousy. "Ruining things" is normal human behaviour. Like the killers in Seattle.