2. If youre afraid of KYC asked someone to do it for you and gave him funds in return. I think this is happening on some cases ( But this is form of cheating)
Certainly an option, but you would be asking for trouble if the casino's books ever got audited and regulators for whatever reason come knocking at your door asking questions. No doubt people do this and I have even seen fake dox for sale on bitcointalk. It is probably the worst of these solutions.
Perhaps I am mistaken, but companies for remuneration with the requirements of KYC, in which I participated, gave more rewards.
Don't know what you mean by 'companies for remuneration' but I don't think the rest of your statement is true, although it could be.
The solution for individuals is fairly simple. If you are comfortable letting an organization know who you really are and the rewards are high enough, do the kyc procedure. If you don't know how the org is going to use your identity information or don't trust them, don't do it no matter how high the reward is. I would also counsel against giving up docs to airdrops and bounties, because I highly suspect they are not required to have that info.