More possible causes for infohazards in VNM multi-agent systems:
Having different priors (even if the utility functions are the same)
Having the same utility function and priors, but not common knowledge about these facts (e.g. Alice and Bob have the same utility function but Bob mistakenly thinks Alice is adversarial)
Having limited communication abilities. For example, the communication channel allows Alice to send Bob evidence in one direction but not evidence in the other direction. (Sometimes Bob can account for this, but what if only Alice knows about this property of the channel and she cannot communicate it to Bob?)
Yes, different priors (especially ones making hard-to-test predictions) largely have the same effects as different utility functions (e.g. this post discusses simulating belief changes with utility changes). The coffee shop example includes limited communication abilities, perhaps there are other better examples?
More possible causes for infohazards in VNM multi-agent systems:
Having different priors (even if the utility functions are the same)
Having the same utility function and priors, but not common knowledge about these facts (e.g. Alice and Bob have the same utility function but Bob mistakenly thinks Alice is adversarial)
Having limited communication abilities. For example, the communication channel allows Alice to send Bob evidence in one direction but not evidence in the other direction. (Sometimes Bob can account for this, but what if only Alice knows about this property of the channel and she cannot communicate it to Bob?)
Yes, different priors (especially ones making hard-to-test predictions) largely have the same effects as different utility functions (e.g. this post discusses simulating belief changes with utility changes). The coffee shop example includes limited communication abilities, perhaps there are other better examples?