We can't really call the mentioned examples as biggest wins unless we know how much the players have lost before hitting it and how much they have spent on gambling from that money. But there is no doubt those are huge multipliers we don't see everyday.
The risk is the same (same odds for any other player). It's just those players got extremely lucky and hit the jackpot, which is something I envy them for.
These are still the
biggest in the simple sense of the word. I'm sure these guys already lost a pretty penny on these games before hitting the one time, big time jackpot of their lives with only a little $$ at stake. But that doesn't matter if we're looking at these figures as-is. They are still huge at their own merit and difficult to top any time soon. Even I am wondering when will I be able to hit such huge jackpots with just a small amount of bet. Tried doing this through parlay but a lot of times I'm just left with an 'almost' winning ticket with a leg or two losing.