I have read the last few posts and questions larry_vw_1955 asked, and he makes some valid points.

OP keeps stating that using multiple accounts is OK, but I tried to explain that it's surely not OK for all purposes. We go back to the "nefarious purposes" that is mentioned in Rollbit's TOS. OP also says they didn't warn me, and I agree with Larry here. After you opened your first account and it got limited, you opened a second. Maybe you opened a third, fifth, tenth... you never said how many there were. If all the accounts you had got limited, is that not warning enough for you? Does that not ring any bells in your head and makes you think: Hey, I am obviously doing something wrong, otherwise I wouldn't have gotten my previous X accounts limited? 

I also agree with Larry that if you had been straight with the Rollbit team and told them clearly: I have had x accounts limited in the past. Can I open a new one to circumvent the restrictions you placed on my previous X accounts to place bigger wagers? If they said sure, go ahead, but then they confiscated your money and banned you, I would support you and consider what they did a scam.

But that didn't happen. You or your friend only asked them if players are allowed to have multiple accounts, and they said yes. You weren't even remotely specific enough to explain what you wanted or planned to do.

A real-life unrelated example:
Am I allowed to buy and legally own a gun? YES
Am I allowed to buy and legally own a gun to shoot people at my local shopping mall? NO

The second one is a very specific question that shows the intention and reason for wanting to have a gun. The first one is a generic question. You should have asked the second type of question before taking any action. But you asked a simple one and you got a simple answer. Yes, you can have multiple accounts. That doesn't mean you can do whatever you want with those accounts.