Insurance fraud: Player abusing a poor game mechanic to their benefit - so send them to prison, even though the whole reason the game mechanic is able to be abused is because the devs allowed it in the first place. Very unfortunate.
Mild griefing: Player team-killing or self-sabotaging within Empire/Kingdom faction. This one I see as legitimate to some degree. It depends on if anyone can join, or if they do indeed have people apply to join a faction and so on. Because part of the counter to large factions is that they are prone to insiding and betrayal from within their own ranks. So if they let anyone join, then you need some way to deal with the guy randomly using ships and crashing them into the station and so on. But if they have applications and qualify the people they allow to join, they should take the good with the bad. The only problem I have with this, is there is already a solution to dealing with bad faction members - just kick them from the faction. No prison required.
Another fair example would be someone blocking another ship in a neutral safe zone, by just cramming themselves or many ships around someone else. One issue I see with this is there are no checks and balances in the game. As such, there will be ways to frame innocent people for this kind of thing. But, for the sake of being able to deter this kind of thing, which almost cannot be helped in a physical game world that also has safe zones, it's a fair compromise.
Super-annoying piracy: Player... being annoying in stealing from others? To who? Who decides what is annoying? I can't really think of an example of super-annoying piracy. Seeing as piracy is probably already super-annoying to people. Maybe someone here can help out with an example. This suggests the devs are enticed to set some unknown, vague idea of how you're allowed to play - that no one else knows - because if you don't play as a nice pirate, then if you get caught you're sent to prison. If there are any kind of nuanced, arbitrary risks with piracy, then those pirates will no longer be pirates, they will just shoot and kill on sight and ignore your scrap because it's not worth having some random, flexible rule be decreed because you were 'super-annoying' in stealing from the other player. Just kill everything and loot the valuables in the wreck and move on.
Mild griefing: Player team-killing or self-sabotaging within Empire/Kingdom faction. This one I see as legitimate to some degree. It depends on if anyone can join, or if they do indeed have people apply to join a faction and so on. Because part of the counter to large factions is that they are prone to insiding and betrayal from within their own ranks. So if they let anyone join, then you need some way to deal with the guy randomly using ships and crashing them into the station and so on. But if they have applications and qualify the people they allow to join, they should take the good with the bad. The only problem I have with this, is there is already a solution to dealing with bad faction members - just kick them from the faction. No prison required.
Another fair example would be someone blocking another ship in a neutral safe zone, by just cramming themselves or many ships around someone else. One issue I see with this is there are no checks and balances in the game. As such, there will be ways to frame innocent people for this kind of thing. But, for the sake of being able to deter this kind of thing, which almost cannot be helped in a physical game world that also has safe zones, it's a fair compromise.
Super-annoying piracy: Player... being annoying in stealing from others? To who? Who decides what is annoying? I can't really think of an example of super-annoying piracy. Seeing as piracy is probably already super-annoying to people. Maybe someone here can help out with an example. This suggests the devs are enticed to set some unknown, vague idea of how you're allowed to play - that no one else knows - because if you don't play as a nice pirate, then if you get caught you're sent to prison. If there are any kind of nuanced, arbitrary risks with piracy, then those pirates will no longer be pirates, they will just shoot and kill on sight and ignore your scrap because it's not worth having some random, flexible rule be decreed because you were 'super-annoying' in stealing from the other player. Just kill everything and loot the valuables in the wreck and move on.