I think @CryptoWoman91 is more concerned about privacy than the KYC process itself. Even if they uploaded a fake ID, what if someday they require another verification, like a live KYC with a selfie? That could be tricky. It’s probably best to decide now, either go through with KYC or skip the bonus and keep gambling anonymously.
KYC is not just a tick in the box that anyone can submit fake IDs and think that they will fulfil the requirements of the KYC.
If someone upload a fake KYC and if the gambling site detects that it is somewhat fake, they can ask for more verifications like Live Pictures etc. Anyone who have submitted the correct KYC details and documents, will not face any issues if the casino asks for further verifications.
I think by privacy safety, we all want that and it is more related to the fact that our KYC details are safe with the site. They will not misuse it or share it with other third parties. When you submit your KYC to trusted sites like Stake, you are very much be sure that your details are in the safe hands.