The clause which RFG’s upon both score and steal makes using this particularly tricky. If you’re using it to get into a remote early to stop a score? Mayfly exists, is 3 cheaper, and even with the two strength down from Nanaq, probably works out to break costs just as cheap at 1-2 ice, which is probably the situation in which you’d want a one off AI Breaker.
Using it to raid centrals for an early steal? Maybe, but then you’ve paid 4 to install a breaker that leaves after you hit a single agenda; worst cases include one point steals. And that’s not even counting the fact that the corp can score out if you’re not careful about keeping the remote checked.
There’s perhaps a play style which could have Nanaq have a bit more utility; if you want to make repeated runs early with effects that replace breaches, removing the chance of losing it early to an (un?)lucky access. Stargate comes to mind first and foremost, with Criminal run based shenanigans(DoF, Sec Test, farming Archives with Leech, Bankroll and Pennyshaver)also a possibility; unfortunately, the extremely hefty influence cost really limits this being played out of faction.