If the business is going well, usually reinvesting in promos, giving prizes and free stuff, makes the ball grow bigger (your customers spend more, you attract more customers, and in the end you increase revenue).
I don't know how it's for Metawin but in my region, if casino reinvests money in giving prizes and lotteries, they don't pay taxes on that money. Btw $700k per month is a very nice promotion and I'm sure it will increase to one million.
Does anybody here play live blackjack? Metawin has a dedicated table for Metawin BlackJack players where multiple people play, the number of people is usually between 20 and 50. You can chat with other Live Blackjack players and also chat with dealers, every time I played there, dealers were always very talkative. Btw on this table, there is a seat for one player and everyone plays with the cards of one player but you can make your own decisions like hit, stand, split and etc. I hope Metawin will also create a blackjack table with multiple sits, that will be cool.