Well your definition of griefers does not equate with the devs ides of griefers...obviously.
I'm trying to think of what would actually be "griefing" in Open Mode.
Blocking a pad at an outpost on purpose so people have to swap instances is about the only thing I can think of.
But proving it is on purpose and not someone who had to suddenly go AFK is a hard one to figure out
(I have children and suddenly go AFK all the time, sometimes for the beat part of an hour. Plus when the phones rings, when the door knocks etc).
So that is not always "griefing", sometimes it could just be real life getting in the way of someones game time.
Using ramming as a way to kill without getting a bounty or to get the other person a bounty isn't "griefing", that is abusing and "exploit" within the actual game.
FD were told ( a lot ) that the speed limit would do nothing to help fix that exploit - but they didn't listen, and it didn't work.
I know some folks still refer to it as "griefing" but by rights it's not. Just a flawed mechanic FD cannot seem to fix.
Blowing up unarmed trader ships, by a wing of 4 heavily armed combat ships, for no reason at all - is part of the game.
Often confused for or labeled as "piracy" or "griefing", which it is not either. Playing the murderer role is perfectly valid in game.
Alas more people seem to have gravitated towards that role than expected, FD seem to think if just left, sooner or later it will balance itself out.
(Ironically if everyone was forced into 1 mode, it would self balance sooner rather than later - as people either left the game completely or moved away from core worlds and became harder to find, as it stands at the moment however, people just leave Open Mode for Solo or Private Groups and now Open players want FD to balance things out for them by giving incentive's in Open or nerfing Solo / Groups.)