Rabbit Hole costs Andy 2 to install.
It doesn’t pay itself back until you encounter 2 traces.
Simply gaining 2 or more credits from an economy card provides the same benefit
Against decks that don’t trace, Rabbit Hole confers no benefit unless you also play Underworld Contacts.
In enabling Underworld Contacts, it adds an additional 2 turns to the time it takes to pay off the original investment - netting a single credit 5 turns later.
The OP starts with a couple flawed assumptions.
The first assumption is that Rabbit Hole is a Perfect Counter to NBN:MN decks. It is not. On the first trace you face, Rabbit Hole sets you back 1 credit per Rabbit Hole installed. This is not “perfect”, as you are worse at avoiding that trace than if you had never installed Rabbit Hole at all. On the second trace, you’ve merely broken even.
If I am playing NBN:MN and I see an Andy player drop 6 credits and 3 clicks on 3 Rabbit Holes, I’m not immediately shaking in my boots, fearing +3 link, but instead seeing a scoring window open up. I am HAPPY to see the runner do this because the runner has opened up an early game window to score Astroscript and seal up the game.
The second assumption is that Underworld Contacts is “clickless economy”. If the Runner follows up Rabbit Hole by installing Underworld Contacts, the scoring window simply gets bigger because they’ve just thrown away a bunch of clicks installing Underworld Contacts [multiples? even better.] and getting the money to install it.
Even if I’m playing a Scorch oriented or Midseasons oriented build, I’m focusing primarily on one big trace to win the game, and x3 Rabbit Hole sets you back economically against a single big trace. If that trace is about to occur, you’ve actually made yourself more vulnerable to it, not less.
General purpose economy is more effective against tracing builds than Rabbit Hole. Magnum Opus is a better choice in Andy than Rabbit Hole, even if the primary thing you want to do with the money is beat traces.