Nothing is stopping any 3rd party from offering KYC and an interface that only shows content posted to Steem by KYCed users. That's why we will never implement it ourselves, because we believe that steemit.com should be open to everyone. In addition, you should be extremely careful with who you give your personal identity information to. I don't know of this service, but I would be highly, HIGHLY cautious about who I give my personal information to and would suggest anyone reading this comment to think extremely long and hard about using ANY service that requests this information. We will NOT.