People do only learn when its already done and realize that they had done something.Its neither they would be complying on whats been asked or just simply moved on because
he/she couldnt afford to expose or give out some documents for some verification.So its a matter of choice whether you do deal with it or not.
This is the important on having that time on reading site terms before making out some action.
If those people can learn from the experiences of others, they don't have to have the same experiences because they will avoid them before something bad happens to them.
If they don't want to give what is asked for, they can look for something else but they have to give up what's in their account because they can't do anything about it.
Reading the instructions on the gambling site before trying to register will always be necessary to avoid unwanted events and so that we don't get annoyed by small things that shouldn't have to happen.