Real players or not then we can do anything to verify it and yes those are insanely amount of BTC being rolled on.
I believe these values shown are just fake, can't be real at all and even if they are being played for real, then these look like bots set up by Yobit itself in their exchange to show their real users that such big bets are being played and won there, thus encouraging those real users to bet big and "lose" mostly. Because when nothing is defined there, no house edge, no player hash, no secret hash, and not even the provably fair issue that's raised by OP, I believe that you'll just shoot in the dark with no possibilities of reaching target.
Regarding on dice on yobit,
yes it do has and its already been a while for them to had this game.This would only pop out on their top webpage if you do have
the balance of minimum of 0.01 BTC and if your balance is below to that amount then it wont show off.
Ah well, there you tried to go over smart. It'll show as 0.01 BTC in the right hand side box (I had an account there and I checked all this after watching this thread) and no, you don't need a minimum balance to see the Dice feature in the exchange (I had 0 balance still I was able to visit and check the ongoing bets). But yeah, in the right hand side, you'll see a drop down box with set amounts with minimum bet of 0.001 BTC, but that's not the case if you visit their dice page. You can even play with 1 satoshi after visiting that page.