For real?
This is the most absurd KYC I have ever seen in my life, the fact that they asked for a ticket is weird and stupid, I mean if their fear is that some one send fake documents the easiest documento to falsificate would be a Shop ticket, we can even print It at Home and then take the picture.
The KYC process is something involved with lot of sourprices. And this thread is a good example.
Most of those acceptable documents are stamped and can be verified easily, this is the first time I have heard of such KYC procedures and to say that the documents were only requested when the ops already completed some KYC steps makes the whole thing annoying.
Less I forgot the acceptable format can also be AI-generated and pass any form of test to get approval so the risk in this is quite high at this point and ops should try as much as reading the terms and conditions of those casinos to know what he can expect.