Some may not require you to identify yourself at the registration point but may ask for that later, and that's the kind of sites that we should be careful of.
I just can't see a reason for using other site then NitrgoenSports,they offer the best odds and also are known for being legit for a long time.
They have been here since 2013 and I can't see them going away any time soon.
True, I've also been using Nitrogen since 2013 and I'd say that I've never had any bad experience with them.
Just a comment on the current list here. The list not been updated since OP posted it and a lot of things have changed in the past couple of months and some of these gambling sites already asks for KYC (if I am not mistaken).
Also 1xBit is a confirmed scam, not sure with the others though.