[Crimsondude]

The UCAS also made it easier to acquire a SIN under Haeffner/Daviar. The lessened restrictions, which basically come down to  being sponsored by SINner in good standing, is also being used by A-rated corps like Microdeck to get SINs for AI.

[cold iron]

Well it seems half of the OPs question was covered but everyone forgot the why. The reason you are sinless by default is because that is the lifestyle that both draws shadow runners and that shadow runners are drawn to. Not all sinless are born that way. Many chooses that life. It could be to doge heat, could be to escape the corporate dreck. Back in the old days when neo-anarchy was the main way of life ditching your sin was a badge of honor and the first step to fraging the man. Not to mention if everyone started with a sin a lot more new players would make the mistak of doing the wrong thing with it on and getting tagged. I think that becaus a lot of the old ways have fallen out of style has made people think differently about being sinless. Sort of like how any guy with a bit of chrome and combat skills calls himself a street sam but has no more honor or code than the weeners.