I'd be a little wary of that. If you gave them your real info at any time (and they do ask for it for Hilton- maybe to match against the account?) they can check. I know they've got mine because, as I noted earlier, I was getting surveys pre-populated with my name and address.

A year or so ago they closed my account- the reason was boilerplate but included possibly failing tests to see if I was paying attention, going through the surveys too quickly, providing conflicting information, etc. I protested and was reinstated. I try to be honest even when I know I'll get kicked out (no, I have no intention of ever buying a current model-year car again) because I know that their main product is a group of honest, thoughtful survey respondents. I'm a fast reader and I CAN legitimately speed through some questions- I'm retired, for example, so a question about whether I'm employed in any of 20 fields is a quick "None".

So, if the surveys want personally identifiable information I just skip them.