The proof is right here:

(merge of my previous graph with the current one)
Way before to 26/07: everything was normal, I was earning from the challenges, like rwinkel does, withdrawing everytime I could convert my tokens to at least 10000 sats
26/07 to 15/08: the machine gets broken, I'm losing every day, all of a sudden
15/08: back to normal. Just for one day. Why? No idea
16/08 to today: machine broken again
Just stating what has been said here numerous times: it usually works, the 0% house edge is believeable, but some days, you just have to lose, you have no choice, the machine won't let you win. It was the same for me, all went well and some rare days it got weird.
Except now it's been like that for 3 weeks.
You can have bad days once in a while, but you can't lose EVERYDAY for 3 weeks in a row.
I think the graph just speaks for itself.
You can't, for 167 rolls, lose 20 times in a row but never, at least once, win twice in a row, that's just impossible. ^^

It is possible, because it happened.