I'm not so paranoid, my reasoning has more mundane justifications. A drive to secrecy that begins with protecting trade secrets. And it is not even nessesary t

I'm not so paranoid, my reasoning has more mundane justifications. A drive to secrecy that begins with protecting trade secrets. And it is not even nessesary to imagine a drive (or intention). It just so happens that spreading knowledge (teaching things to other people) is hard work (for both the teacher and the student). So as much as it's not a priority for them at the forefronts of science to teach their advanced theories to others they end up known by only a few (this also foments a stronger "market position" so to say). So it boils down to incentives, how motivated are advanced research institutions to spread their advances in contrast to any benefits from a scarcity of such advanced knowledge?