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https://jumboticket.com/faq. The winning ticket numbers are determined by these numbers which can not be pre-determined thus cancelling all chances of foul play.Its based on RNG (Random number generator)
So i dont see something different on here, what things that makes me doubt is into those winners list winning millions? I dont know if its real.
now that they have thread here, maybe at least 1 winner will come from the forum and attest about his winnings. the rewards are quite huge, so it is hard to verify if indeed those winners are real. we only trust the site that they are running legit here.
and when you look at the difference between provably fair and RNG
here , they are both vulnerable to hacking.

so in this case, you are just really trusting the site that they are not screwing the players.
RNG is not a fair way to select the winner, it can be rigged. They should use the block from X date to determine the winner, which would make the game a real provably fair one.