Not sure about the ethereum deposits or withdrawal but the only site which fits you description might be nitrogen sports , I haven't used that site but till now never heard any complains about withdrawal, asking for kyc
There bet slip takes time to confirm but you can always post in their chat and it gets confirmed right away
nitrogen is a recommended site .. they can provide comfort to the players ,, although they have not confirmed eth there ,. it would not hurt to keep gambling there using eth, because you will not encounter any obstacles in nitrogen
How about the bustadice that you wear in signature?
I heard bustadice having another option of deposit or withdrawal currencies like altcoins i saw in their thread.
I don't have account in nitrogen but i think is the same as you deposit like bitcoin as a currency in betting.
I think transaction fee of bitcoin and ethereum almost the same so i must prefer on bitcoin than to altcoins in deposit or withdraw in gambling site.
Bustadice does not offer what the person is asking for which is sportsbetting with these features in mind.
Last time I looked they only offer dice betting and do not think they will be offering wagering in sports as that is a total different beast all together.
There was a site that tried to do it but can not recall if they succeeded or not which they had only casino games on their site and were saying they were soon to have sportsbetting allowed again after they got all the bugs out of their system.
So that statement right there tells you that it isn't too easy to integrate into a site as one might think it is.
Also to answer the original posters question in the first post
I would say no KYC is what I would like to see in a site I wish to be drawn towards because I still believe that satoshis dream is for bitcoin to still be an anonymous ecosystem.
As much as possible atleast which I know it isn't completely.