Alright, that's interesting! Generally speaking, the e-mail address serves as a unique identifier in most of casinos, but in this case, it probably allows you to use it again, because then it assigns you the unique account details starting with HZCR...
So if the bot is able to identify not only all accounts registered in the casino under the same e-mail address, but all accounts across their casino group, then it's very strange they let you create new accounts using the same e-mail address. Especially when it's forbidden according to their TCs. On the other hand, this rule they have in their TCs isn't strange at all. It's the same in most of casinos and you can't deny you breached the rule.
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