The similar interface about this casino and 1xbit has been discussed in the second page of this thread and you can see the explanation from the representative here https://bitcointalk.org/index.php?topic=5418423.msg61194273#msg61194273

But there's no sign if the casino is scam until now, it just depends on each user's faith to trust Megapari or not.

What I know is they have an active signature campaign, run various promotions e.g. giveaway, and there's no issue about the reward distribution.