The fundamental issue is with the explicit interpretation of the term exploit. We can all read a dictionary, but interpreting the definition of a term heavily depends on context.
Where FD are concerned, they seem to be referring to actual "exploiting software bugs" (e.g. the G1/G5 engineering cheat) rather than "exploiting balance concerns" (e.g. long-distance/kill-N-of-X mission stacking). The latter is highly subjective, the former is not.
Overall though, you are right - there is no FD approved list of "software bug exploits" that players can use without possibility of recrimination.
Well thats the normal Definition of the Rules after all.
The Rules State that your not Allowed to Exploit Bugs.
Bugs are Programming Errors due to which Mechanics that are not Working as Intended.
Thats why for example Combat Logging by just going to the Menu and Exiting the Game during Combat. Is not Prohibited.
While Combat Logging by Crashing the Process is in Fact Prohibited and Acted Upon.
Its also why FD wont be Banning People for using Sothis or something.
Because this is part of the Mechanics. The Mechanics are that a Station Desperate for something will Pay alot for getting it.
So if the Station needs to Deliver something and the Station it wants to Deliver to is 300ly away it will Pay your accordingly.
What many People dont know.
When they Relog for example. They dont Update the Mission Board.
They Change their Instance. And Mission Boards depend on the Instance your in.
Now Relogging to Change Instance is not Prohibited. Its not an Bug or Exploit after all.
If FD wanted they could easily Bind you to an Instance.
What for example might end up with People being Punished is the current abuse of Stacking Missions which share an ID.
Thus causing the Mission to Update despite you never having Accomplished it. But have instead Accomplished an much easier Mission.
Because thats clearly an Bug. Its not an Intended Mechanic. And People constantly abusing it. Might end up being very Sorry for that one Day.
Now its an Bug Exploit that can happen Accidently very Easily. So FD wont be running a Big Hammer like with the Engineer Bug

But I would not Feel Safe in these Peoples Shoes
If you want to know whats allowed and whats not allowed.
The Question you need to Ask is only if this is how its Intended to work. Or if its an Bug thats likely not Intended to work like this.
And Chances are. That if you have even a Basic Human level of Intelligence. Anything that you fail to Identify as an Bug. Will not end up being Punished even if it is one in the End.
Because lets face it.
If you run a Mission and Suddenly all of em Update for the First Location you Visited. You know that this is a Bug.
And if you Stack 9 Expensive Missions for a Target 300ly away and then 1 Cheap Mission for a Target 10ly away. After which you go the 10ly Target and then hand in all 10 Missions.
Then Everyone and his Mom knows THIS IS AN EXPLOIT AND YOU DID IT ON PURPOSE
And anyone seriously claiming he did not realize this as an Exploit. (Sorry for being blunt) is Clearly Brain related to Donald Trump
