@ireneista @smallcircles @kopper if we want to make policy for the fediverse as per this (great) discussion, and particularly for matters regarding information retention, i think we also have to consider the fedi server as an imperfect proxy for the user accounts it represents, because users cannot send Delete requests of their own volition—they must be proxied through the server, who represents all aspects of their identity in the current system.
so if we want to make policy around mutual deletion as per OP, we have to incorporate how each user's admin is currently acting as jesus in the consent meme (except even more powerful, because your admin can also falsify your affirmative consent as well as rescind it over you). i wouldn't call this a "blocker" to solve first (because it's such a big problem), but it's an example of how the fediverse in practice would complicate any policy decision around this matter.