Define "fair" versus "unfair".
It's easy to point at the extremes: Reg-Ass Leela is fair, Dyper is unfair. HB Foodcoats is fair, CI-7 is unfair.
But let's go to the more blurred ones.
Is Shell Game PE fair? It doesn't rely on economy as much, nor does it work off the ICE/Icebreaker interaction.
Is IG-54 unfair? It doesn't play a combo of cards that randomly wins the game. It's quite interactive.
Is Sunny Lebeau Prison fair? It's barely interactive in the early game, and just like Dyper will have "technically won" in the lategame. It just takes longer for her to.
Is WyldCakes Whizzard with Faust unfair? It relies heavily on ICE/Icebreaker and economy battles and aims to actually steal agendas in every phase of the game.
My point is this: "fair" and "unfair" are terms people love to throw around, yet are incredibly hard to actually define. Netrunner is a massively complex game with countless interactions, and we players are extremely creative in making new ones.
Not only would a ban list like the one you speak of be extremely subjective, as everyone believes different interactions are fair or unfair, but you couldn't possibly foresee everything players could come up with.
Somebody would read the ban list, think "Sweet, card X isn't banned, I've been dying to try this combo", show up to the tournament, and thus have made up a new "unfair" deck.