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That’s the point of the repuation system.
It’s a very hard problem, I’ll give you that.
What you need is, each instance and community collects reputation in the federation. then users posting on those instances can collect reputation on those. basically by not being banned or massively downvoted. Your reputation is weighted by the reputation of each you collected it from instance.
Each users identity is tied to some key that collects reputation, that you generate new identities from from for each instance/community/post. Like how some credit card services give you a new credit card number for each new website.
Admins don’t know who you are, but they can see and verify your reputation.
Then instance/community admins can decide if they want a different weighting. For example, to completely disregard the reputation by some instance or make one you like 10x more important.
You could get an ordered list of posts or pseudonymous users based on the reputation. Untrustworthy users will glow like a christmas tree.
That would be one way to do it. It’s hard to make it water tight, but any improvements would be better than the current fediworse.
devil’s advocate: this will save the vast majority of user (which are completely tech illiterate) from loosing their most important data
lets be real, none of them will use a private or foss backup solution any time soon.
I’d rather not they loose their important family photos for that oh so horrible crime of offending my privacy nerd sensibilities