Just as land-based casinos must be regulated, so do their online counterparts. In order for an operator to offer games of chance, such as video slots, table games, or sports betting, legally, they must have a license that covers the territories they want to offer the games.
Yes, it is possible to make a profit from online gambling, but it is not easy. There are many factors that need to be taken into account, such as the type of gambling, the odds, and the amount of money you are willing to risk.