I might've said this before but other gambling sites do the same thing, they'll usually mention parts of their rules but not show the proof of how they found the link between different accounts.

If you used a vpn maybe that could've caused the issue since they also locked mine (this was before they changed the site) but they were kind enough to let me go after I gave an explanation.

They're probably desperate to get new players because you wouldn't be given a second chance if the same scenario happens on other sites.