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Just remember what? Unless he claims to be somebody else he is hardly committing any fraud. If they don't remember him or if their system doesn't remember him - isn't that their own problem?

But the steps people take to get a discount... He could probably just straihgt ask for a discount and get it anyway without making a new registration.

No it's wire fraud. I invite you to back that somehow.

Using different emails or addresses or different cards is not illegal

Lmao having multiple email addresses or H&M accounts is definitely not "wire fraud."