when you created the second account you didn't read the terms and conditions? or maybe you already knew it and intentionally you wanted to get the advantage of opening a new account.
I do not know if Shuffle is having any deposit offer and set limit or having other promotional offers that can encourage people to have two or more accounts. Some will go for another account because of referral reward and have some.other accounts because of that. Many multiple accounts are done intentionally by the bettor just because of their personal profit.