How possible for the website to be scam? I guess it's very likely. Why? simple, they don't provide enough info about who they are, not a registered company, and most importantly if you visit their FAQ
How does playing Bitcoin Jackpot work?
When you play Bitcoin Jackpot, you are purchasing a raffle ticket. At the time of the draw, a winning ticket(s) is selected at random using random.org which is an unrelated third party; the draw will be live streamed on YouTube (or another video streaming site) when every ticket is sold. To make things as fair as possible, the draw will be conducted on video by people who are not related to Bitcoin Jackpot.
You know there are tons of ways to hijack such 'cheap' method to pick a winner, it would have been totally different if they provided a provably fair method.
The whole thing seems sketchy to me, because I've tried to make a provably fair lottery before, just failed with marketting, and it didn't need any registeration or user information too.