@Gargron @bthall Relying on that promise is indeed the important part. Though there are legal ways to ensure they will keep their promise (if they wish to do so).
Not sure I agree with the other points though. While those qualities are the case with mastodons unique approach to decentralization I dont see them as inherent qualities of decentralization.
I would also say that the reduced cost argument isnt valid to mastodon or virtually any decentralized system. In fact due to additional overhead if anything the overall costs are increased. The difference is just that the cost are spread out between the servers so the burden isnt on any one person/group.