I guess this is a potential disadvantage to decentralization. With a centralized site, the owner would have a vested interest in the security of the site because culpability for stolen passwords or other nefarious things would fall back to them. Here, with a decentralized model, instance owners can manipulate the particular instance to not match others and do nefarious things. Up to now I had only heard of the benefits of decentralization and hadn’t thought of this. Food for thought perhaps. All it takes is a few or even one nefarious instance (if its bad enough) to spoil the general public’s thought on this model.