I'm not sure there are casinos that give their players more wins than losses, the goal of the casino is to make a profit, so they will give players more losses than wins, even though the casino often gives free spins, the results are unlikely to always be profitable for everyone like last night, where I gambled with the capital I had, honestly, in last night's gambling, it was very easy to get free spins, maybe there were five or six times I got them but the results tended to be bad, it was annoying but there was no surefire way to make free spins better. Well, in my opinion, we shouldn't try hard in gambling, because this big influence of luck is what will determine it, not with our own efforts. I'm sure no matter how hard you try, it won't guarantee that players can get a profitable win if they are not lucky, then there will be no results that can be obtained.
For me, free spins are one of the many ways for a casino to retain a customer as much and as long as possible. While you wait to receive these bonuses, it may take a long time, but during this time you will have made a deposit that the casino is interested in. I also agree that the casino business is primarily concerned only with its profit, and those "goodies" that customers count on are just marketing that works for the casino owners' wallets.
Exactly, as you said that free spin bonuses are one of the other ways that casinos have to keep gamblers going, it increases curiosity, because usually from what I have noticed most of the gamblers involved in this type of casino game manage to get the maximum amount of winnings such as maxwin when they manage to get a free spin bonus with the scenario of getting it for free or by buying it, or what I mean is more gamblers who manage to get maximum wins like maxwin through free spin bonuses so maybe that's why many of them even make deposits again when in the first step they failed to get the free spin bonus.
In fact, free spin bonuses really can't guarantee that you will be able to get big wins like other people get, in the end for the results of course it comes back to your luck, so I suggest not to be too excessive in pursuing something that makes you curious, don't make other people's wins a motivation, remember that gambling will always be a risky activity, and also understand that casinos are very smart in implementing strategies to keep gamblers going longer.