This rule bothers me. DC powered "computer" fans are pretty ubiquitous, using a different brand/model isn't going to give you a competitive advantage. On top of that, it's borderline unenforceable. Does the GDC really expect all inspectors to have a list of every year's KOP and try to match model numbers on every fan that shows up on a robot?
Sorry for the rant, but it would make things so much easier if the rule were something along the lines of "DC powered computer fans of size X or smaller are legal". Easier and cheaper for teams who need to cool a compressor/motor, and much easier for inspectors to enforce.