I’ve managed to win from free spins, but it was no more than 17–19 dollars, and I had around 150 spins as a gift, each worth 0.2 dollars. I think that’s actually a decent ROI, but the total amount is still very small, so I don’t consider spins a good way to win unless the bets are significant. I have no idea who manages to hit x20,000 multiplier. I’ve never won more than x3.
Free spins winning amount is more than me I can't recall, but I think I have won less than you. And for 20000X multiplayer it might be a dream of every player but there is no one whose dream can be come into true. If comes true, then the person might be the luckiest person in the world. I never tried and dream too much as I am happy only if I can make 10X.
I recently had a big win. Technically it didn’t come only from free spins, since I also placed real-money bets, but it turned out that one of my bets triggered 10 free spins, and one of those spins was so lucky that it gave me a 5000x. This is different from a major win coming exclusively from free spins, but in any case it’s a huge multiplier, and it was the first time I had ever won something like that.