The comments above indicating 'well someone has access' - yea, obviously, it's data hosting. Someone has access.
But the amount of conspiracy here is frustrating.
Amazon will play very aggressively within the bounds of the law, meaning, if they can glean public info about something, or look at their own sales data for a product, they will do that.
But to look at s3 data would risk the entire empire.
It's rational for people to be a bit skeptical, and so Walmart can say 'no data on AWS' but it's also an easy thing to do.
Now - is it possible that new retail PM, who used to be an AWS PM, and who for some reason still had access to things he shouldn't - went ahead and did that? That could happen. And maybe his boss finds out and looks the other way but calls IT and tries to have the loophole closed quietly. Etc.
As a policy are they trying to copy your product and even ask you for information and aggressively pursue customer data? Yes.
As a policy are they looking at your S3/ec2 data - no.