Anything we get from a free spin should not be complain about because it was a free game that we did not pay or lose any money playing therefore we are in profit regardless of how much we made. When we stop complaining at the rewards of being small and appreciate what we get then we can start using that small reward to wager more and we can become winners. I like receiving free bets and I always use them almost instantly to play some slots or dice games and get lucky at times. To enjoy the games better, I prefer to stake money and use low staking amounts to play multiple times until my lucks comes and gives me the winning. The reality in gambling is that, you do not make it big from free spins but when you wager money.
On the other hand, I do not agree with one of the opinions you convey about when you stop complaining then victory will come, remember that especially in the type of casino game whose name is victory does not depend on whether you complain about the results you got before or not, because after all what determines victory is only your luck.
But I also agree with your last opinion about when you want to enjoy the game then you have to bet with a minimum amount.