The alpha testers are people picked by feldon and myself that have been forum members around here since the beginning 8 years ago. We have all had dealings with each other for so long on the forum that we know what to expect and so do they. Plus they are all generally computer guru's so that if something goes wrong with their systems they know how to correct it.
That way we don't take a chance of messing anyone's systems up, or need to worry about sneak shots showing up anywhere else.