If this bet is from no deposit bonus requirement promo, even if he wins or hit max win he will only receive a maximum of $20 according to the terms and conditions of that promotion. I feel bad for those who participated and those who had the idea for this promotion; it really makes the casino look bad.
I remember @panjul also experienced this when he was playing at Sherbet won higher amount based on the said promo.
Do you mean $20 give away contest? I didn't follow it because I was sure I couldn't meet the wager required, 200x was too high and beyond my means and the odds were also very small.
I had a better win on candy crush, I thought I could get maxwin because the multiplier was already very big but in the last few spins there were a lot of dead spins so I could only win 335x the bet.

Replay:
https://replay.pragmaticplay.net/AlF7IJ224o