Same, I'm waiting on freespin event of Duelbits. If I'm not mistaken, They are giving away free spin on a certain match on sports betting. They are doing this promo when there's no boost odds promotion as an alternative. I remember one time I have a very good run too by just using the 5$ exclusive reward and convert it to 60$ profit by on winning boost odds and participating on bets with free spin.
The guy that you quoted is indeed very lucky on his gambling activities.
It has been a while since they last did that but hopefully with the upcoming worldcup, we will see more sports promotions! Ideally a combination of risk free bets, getting free spins when placing a bet of 5 or 10$, odd boosts or other promotions.
A good time to promote knowing that there are many gamblers who love betting with Worldcup,
promotions are really active during this season and in each promotions, gamblers will have that opportunity to win
decent amount during the promotions. If you are lucky enough, you can convert more. Just keep playing and hope
that luck will back you up after getting some extra fund out from the promotion/bonus that being applied.