I do find it odd that they are asking for more, I mean Facebook and Amazon are global companies but they don't ask that much for a KYC, I am sure that they are the 4th one that @mk4 is pertaining too.
Facebook and Amazon aren't financial services--crypto exchanges are, and that's why most of them are starting to ratchet up their KYC requirements as they become more regulated. As to why some have less KYC requirements, well, crypto exchanges are spread out all over the globe and thus have varying amounts of regulation--and some exchanges like Yobit are probably operating without complying with regulations (and I'm betting exchanges like that aren't going to last long).
KYC is only going to get stricter, not less strict. I hate that this is the case, but it is. I'm just surprised that it's taken this long for the wild west days to disappear.
KYC is evil and completely unnecessary.
I don't think it's evil, but it definitely goes against the spirit of cryptocurrency. However, governments don't give a shit about the spirit of crypto and they're the ones that have the power, so if you're completely anti-KYC, I'd say stick to the exchanges that currently don't require it for as long as they're around.