In betting you bet your amount than you get the reward. In this if you win than you will get your amount.
But free spins are free and in this case you will never get big amount and not sure that the withdraw will be possible or not.
I don't agree with the word " not possible". to be honest, free spins do not promise 100% winnings, i know that. But for some chances, you can get a lot of money from free spins feature.
I agree with your statement that the reward is can be smaller than the total amount of bets we make when we get free spins, but that doesn't mean it's impossible to get a lot of money. It all depends on your luck when you get these features.
Every free spin we get, will never promise a 100% sure win. keep in mind that every slot machine game, not all of them give luck. there are many options that we can play to get free spins, but only a few games only provide good rewards from free spins. even with Free Spins, no guarantee of reward commensurate.
to be honest, when i play slots. I'm just looking for free spins, most of the rewards from free spins are not as expected. however, if luck is on our side. not infrequently the reward that I get is multiplied. seriously, this is my personal experience. so basically, as we agreed. in essence, it all comes back to our luck. after all, what we're playing is luck-based gambling, so it's only natural that the rewards from free spins aren't what we expect.