Gambling against the house is not in itself a scam as long as the games aren't rigged and the odds and payouts are as advertised. A game with negative EV is not a scam if it's entered into knowingly by a player.

For my money, games where people pay to win worthless digital goods are far more scammy than a fair game of Blackjack in Vegas where you actually might come out up.

The other aspects you mentioned are the scam.