I play mostly tournament poker and Spin & Go as well.
My experience of playing Spins is 3-4 years. For me, this is a simple opportunity to score points in the rewards system and play when I don’t feel like it or don’t have time for MTTs.
Until recently, I mainly played 0.25$ in two or three tables, occasionally switching to 1$.
During this time, I won two or three times 025$x100 ($25 to the winner) and somewhere in two or three took 2 or third place.
Here is my first win in it
Once knocked out 0.25$x200 (50 dollars to the winner) and took, in my opinion, third place (5 dollars).
Literally at the beginning of this month, with the growth of the bankroll, I switched to a $1 buy-in, and after a few attempts, a 1x100 tournament came ($100 for the winner and $10 for 2-3 places).
I won it, as I wrote in my thread
https://www.cardschat.com/forum/poker-goals-challenges-and-wins-46/lucky-day-512766/post-6505935
So... I'm personally wouldn't say that there impossible to have a big win at Spin &Go tourneys