Possibly the least used agenda in all of Jinteki, Braintrust doesn’t give much bang for its buck. Requiring a double turn scoring window in order to get any bonus out of scoring it, and its effect is not going to be as needed once those ICE protecting it have been rezzed to keep that scoring window open. It is a three for two, which in a Fast Advance strategy is just what the doctor ordered - Some Jinteki have tried that approach, but it has never really caught on.
It could be used for some crazy positional ICE Whirlpool Cell Portal infinite loop combo kill server, but the number of moving parts in there is simply so complicated, it is unlikely to ever be pulled off with any sort of consistency. It is possible that Braintrust would see more use with Fast Advance strategies out of Jinteki, a place where most players have not forged ahead - and that means for at least a little bit, it could be quite a surprise deck to see.