I've played quite a few games with this ID this month, and it behaves much differently than I thought it would. Another reviewer likens it to Argus Security: Protection Guaranteed, but that's not quite right, as the runner can multiaccess with impunity. It really behaves more like a yellow Industrial Genomics: Growing Solutions, but arguably with a more potent ability. Whereas IG requires a single scary run on Archives if you want to trash their cards, CtM's ability can't be turned off (except with Employee Strike, of course!). While IG makes trashing things a puzzle, CtM makes trashing things totally unpleasant, all the time.
The net result is that your ability might only fire 1-2 times per game! And that's great, because it means the runner isn't trashing your SanSan City Grid, Red Herrings, Ash 2X3ZB9CY, Product Placement, or Prisec. Your PAD Campaign and Launch Campaign can sit rezzed with impunty. Let them check an installed Mumbad Virtual Tour, forcing them to spend 5 to trash it, and then endure the trace.
You can look at the ability as "the runner must spend 1 click and 2 creds to trash the first installed card each turn," but there are ways to severely change the math here. Add as many Aryabhata Tech to the deck as you can fit, which will make the runner seriously question whether the severe credit swing and loss of a click are really worth it. Capitalize on other powerful traces: Gutenberg, Bernice Mai, Hard-Hitting News, and Hatchet Job can all synergize with the Aryabhatas (that aren't unique!). If you have space, try a copy of Manhunt: a zero-link runner will have to spend 10 creds to trash a PAD campaign and avoid tags. Primary Transmission Dish can add some oomph to your traces, but I have never rezzed it unless the runner had at least 2 link.
All in all, NBN: Controlling the Message feels like the "true" NBN control ID. Spark's ability is great in the early game, but if the runner can stay above 5 credits, it loses its sting. Harishchandra is fun and is better for landing kills, but CtM really helps you control the flow of the game and the runner's choices by imposing extreme consequences for runs.