Trust would be the main issue and there are no clarification on how funds would be held or handled and as long the community can't able to see about their finance capabilities then expect yhay that they won't really be getting something in terms of attention on gambling field and also this do involves million of dollars and they have said that they couldn't submit any personal details of winners and they would be standing in behalf of the winner? That sounds or looks too risky I would say because there's no assurance that winners could get their prizes fully.
I agree with your observation, this is online we are dealing with developers, who should be transparent on what they are giving out, they claim they are giving millions, it should be verified by an independent body, not testimonials coming from random people, I don't see in the homepage that they are verified, licensed and regulated or even popular media coverage.
People should do their research we are not talking of hundreds of dollars here, they are claiming to give out millions here but no transparency on their part, you have to check the legitimacy of what they are offering before being tempted to deposit and bet.