I can imagine only one situation when gambler can have several accounts - a situation when he wants to hide his activities from someone. Lets say have one account that person shows his second half, possibly to show that he isnt spending much on gambling, and other account where that person gambles the way he wants without pretense. But that isnt right thing to do. Any secret will be disclosed anyway. Or maybe a person has two income sources and he does not want money flows to cross.
Even if that is the reason or any reason in the world, a person can always have accounts on separate platforms; you don't necessarily need to have two accounts on the same casino because that's against their terms of service and you will get in trouble if you are caught, and in case they ask you for identity verification on both accounts, one of them will still have to be closed down because you can't verify two accounts with the same identity on a single casino platform.
You can basically find all the games and stuff on every casino. I know that there can be differences in services, layouts and whatnot, but I bet no one can convince me that there aren't two or more reputable casinos in the industry that one can use, in fact, there are plenty, and they are all doing good business which means they are legit and good.
Hence, instead of going through all those troubles, the best way is to use two different platforms if you have a reason to have two gambling accounts.
It is a matter of a habit. If I am used to one casino, why would I gamble somewhere else. Another example why people could use several accounts: a person is addicted, he is being monitored, lets say by his family. They monitor his bank account and set limits. His is used to gamble at Rollbit (
). When he run out of limit, but still have desire to gamble, he could use his second secret bank account to deposit and gamble without being noticed. I think such story can be true. That second or another account usage is directed not to cheat casino, but others.