For most of the sites that it's listed in the op, maybe, because I think some of them are new and some of them are not really popular here in the forum. They haven't build a solid reputation so it will be easier for them to turn into a scam if they wanted to but for some that are known here for years like freebitco, I am sure that they will going to pay. They have made a partnership with some companies and they don't want to ruin this connection by doing something that is not right.

Real life lotteries or government based lotteries will cut your winnings because of taxes but I think that doesn't happen here in crypto gambling and also the payouts here are going to be paid more faster.