When I saw it for the first time, I also feel something suspicious about those big win but since most of the bets under the real time winning tab is hash game, we can check the transaction of those winnings. I checked some tx hash and they seems to be OK. I mean the information under winning tab (the amount) is exactly what we can see on the transaction hash. I checked 5 random hash as follow:
https://tronscan.org/#/transaction/a86475509ca335134d5a8ffa9d3637d2b4692f2837cb1a6c14d93d5566ee7e45
https://tronscan.org/#/transaction/57ea577fed32d0fa826018976b30d5ae16f9344b756af769fdb4c88e42b5d8f2
https://tronscan.org/#/transaction/01d7c85cd684179cc139886b4c6a837c1e7accb22ef5c120888005a676b89ba7
https://tronscan.org/#/transaction/232b619723982e8b439b72b4d5b612a5a7a8a7e247841670a920ba213071b2d7
https://tronscan.org/#/transaction/d6693f83f883f16d7b22525daa06aae3f2bc4d07f0444ad276286ecf2f17270c

Surprisingly, all the above transactions were sent to the same address. It seems that it is an address of high roller, because when I checked other smaller win, the address is different so I think it is really real.