Probably because there was just too much information to make sense of all at once. So they just let out little at a time of what they understood to be verifiabl

Probably because there was just too much information to make sense of all at once. So they just let out little at a time of what they understood to be verifiably and properly true. Of course the cynical view that they held on to it to make some ad-money is not altogether wrong either, just unlikely to be accurate.