Making a free spin nowadays has plenty of rule and terms and conditions that is backing it and we won't be able to make a big winning from a free spin since different casinos do set a limit. I don't think we could make a lot of money from a free spin. Since the tittle has really explain what it means and shows that we it could give us some few dollars but can't make us rich.
There are some casinos that likes giving free spin to new users especially after there first deposit which look like a way to make there new users to become attracted to the casino mostly when they win some dollars with the spin.
Indeed. You can't really win big in free spins because from the name itself, it's just free. Why would they bother to give you a huge amount of winning prize if you didn't take so much risk, right? So, they will just set a specific limitations that you could possibly win for them not to be on the losing end. And they are most likely to give free spins to those players that will deposit a certain amount. This is to entice the players to make a deposit and play to win "free money" which isn't technically free.
Although certainly, you have to wager before you can withdraw your winning. In this case, you must assess if it's worth the shot to wager a minimum amount just to be able to withdraw your winnings. Because if ever there are people who win big in free spins, the chances are they are most likely paid or sponsored to promote the casino to encourage people to try and play.