They are completely entitled to ask for the OP's parents information if they are following a trail under AML which is what these identification and verification processes are all about.
The fact is if they start down a trail, under the guidleines, they are not supposed to stop until the trail ends and are allowed and actually encouraged to do this.
Problem here is the UKGC guidelines are too vague and open to being used in different ways, potentially being used to a casinos benefit away from its intended purposes.
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I get the impression Casumo and many other casinos have taken it upon themselves to use the £2000 threshold to do their SOW and/or various checks.
Anyone wanting to read more here is the link
There is no actual guideline for when this should be employed in the customer journey.
I must admit, having seen it so many times with so many casinos it does seem somewhat cynical and there are definitely operators who abuse this but trying to put myself in a casino operators shoes I wouldnt want to do SOW on sign ups and wouldnt want the UKGC checking a withdrawal and not being seen to be compliant.
In any case, if the OP just wants their money back as they cannot complete the SOW then they are entitled to it in my opinion.