OK, fair enough - I'm still not really clear how that could work any better than simple anarchy. The Ubuntu movement has set up voluntarist towns in South America and Africa - yet as I understand their model, they function using a traditional 'tribal' idea of having 'elders' who make key decisions. To me that is not necessarily any better than any other form of hierarchic system.
The problem is always 'power over' - so what is the outcome if I am part of a group of people who form a collective and have governance through voluntary agreement and someone who has 'sway' for one reason or another decides something that I don't like and cannot live with? My only option is to leave... So, then I have to leave my friends and family to avoid having to conform to what I don't like. When examined in thought this might sound fine, but in practical terms that is not a simple situation at all.
Essentially, the core issue here is personal empowerment and the presence of balance or imbalance. If there is any barrier that stops me from being free and doing what I need/want to do - such as, for example, the barrier of land 'ownership' that has evolved to be imbalanced - then no amount of removal of hierarchy will solve the problem and we are back to feudalism.
I agree about your definition of tyranny and again it all comes back to personal empowerment, part of which is being empowered enough to not go along with the commands of a tyrannical 'leader' who forces you into his/her army.
Well, with such a basis for further agreement to 'ride' on, business would be easier to conduct. Maybe not, but it seems that having known points of agreement already established through prior examples would make drafting other ancillary agreements easier, and avoid much revision.
And as to the example you provided of a commune, that is a part of the problem with communes. It is a good example of real world issues communes actually face, and people have to decide how to handle. Being authorized to make a decision doesn't make that decision necessarily easy, however.
Regarding extant property, I haven't had my morning coffee yet, so am gonna have to defer that issue.
That is a thorny problem, and I'm pretty sure I alone will not come up with the solution.
Edit: I failed to address the Ubuntu movement you mentioned. This would be another example where knowing what their governance model is would make it easier for me, or you, to decide whether we wanted to participate.
I, like you, am not enamored of a council of elders making decisions for me. Such a hierarchy is less than ideal, and I'm agin' it.