None, there is no reason to not drop a Titan BPC or two in this event.
In fact, there is a big reason to drop at least some Titan BPCs, because if they didn’t nobody would believe such an event any time CCP does such a thing again and then rightfully so.
Talking about ‘believing’, nobody will believe anyone who says they pulled a Titan BPC as many of us have seen reddit memes about it already from people who claimed to have obtained multiple Titan BPCs.
I wouldn’t be surprised if the only way we will ever hear about the amount of Moloks entering the game from this event is from CCP themselves.