I can only think of one reason why anyone would decide to use multiple accounts for a casino site.
Claiming the free spins, bonuses and promotions might be the reason but other than that I can't think of any reason why would anyone need multiple accounts.
It's better to avoid such practices. Just imagine you win a huge reward but you are unable to withdraw just because you had an alternative account on the site.
Exactly, it's unethical and it's not worth it. Those who create multiple accounts to try and get bonuses or promotions more than once are basically cheating the casino and that isn't a good thing. If you are caught cheating, you will lose all the money that you have in all your accounts because they will get flagged, I don't think anyone would want that to happen to them.
Someone who intends to gamble without getting into any trouble or facing any issues would never think of having multiple accounts. There is nothing wrong in trying different gambling platforms because that isn't wrong, you can have 10 accounts in 10 different casinos, but having more than 1 account in a single casino is wrong and can have severe consequences sometimes.