I think your logic is off here.
If you have a 33% chance of winning and you have to win more than 50% of the time in order to be profitable (just for this example assuming its always the minimum reward) then you. Would be losing money.
I think spin and go
is a bad game for beginners because it requires a great deal of skill to have an edge over the average skill in the player pool as well as a massive bankroll. I think you need like 100 to 150 buy ins just because of how high the variance is. Spin and gos are fun and addictive, but not a good choice for beginners who want to make a profit, but if you are playing poker for entertainment and not for profit, then by all means go for it.