So after you load the card they ask you to verify with ID?
If that doesn't sound like a scam scheme performed by a company then I don't know what is then.
Same thing happened to me when I was using Sportsbet.io as my sportsbook:
As soon as I won over 1btc then they asked for me to prove my id with requesting my drivers license/passport and utility bill.
Provided what them with those items they wanted and still they did not pay me accusing of another thing.
They don't intend to pay you if they know they have a chance of keeping alot of money in their pockets instead of paying out their customers.
Typical scamming behaviour.