I’m just trying to collect some data, also I guess this post will be useful for the rest of the forum users.
In my case, in 2018 I loss 32 times one after another using the dice system on freebitco.in.
Honestly I have one of the shocking ones as well, sure we have seen bigger numbers before but actually living it is something else. I had a 22 loss streak, and that was one of the worst days of my life, I actually tried to calculate my wager based on 20 loss streak would not bankrupt me, so that means I had chance to lose as much as 20 and still would recover on 21st bet if I won, and somehow I still managed to lose 21 in a row, and had a payment coming my way during that time and deposited there as well and lost that too right back so it became 22 in a row loss.
I have to say I would agree that it was provably fair, it was just-dice back in 2014 or so when it became super popular with their first off-chain betting system (either them or primedice was the first) and I gambled for many times before I had that 22 loss streak, but life happens, what can I do.