I made a 100 $ contract, it seems is OK, so i will wait and try a large amount later
OP... did you read the replies on this thread? everyone was against the platform and they all had good reasons for it.
In addition, even if this 100 bucks contract went fine, it doesn't mean you can trust the platform specially with a much larger amount as it could be a bait. Since we're talking about large amounts, the owner/scammer could even decide it's a good amount to run away and move to a new domain.