It would be good for newbies and many people on this forum that are not even newbies to read the terms of service of the gambling site that they are using. Having more than one account is against the ToS of all or most of the gambling sites.
I am not a gambler who spends 2x for 2 accounts. Because besides the risk of breaking the rules, it makes me very ambitious, it is better to be rational with 1 account and only need to make a deposit 1x. In addition, with the same casino, this is not an ideal way to take advantage, there will always be one loser.
It is better to make sure you are not violating any protocol of the site so you don't need to look over your shoulder every time you feel you are breaking some of their terms.