I recall when they did that, and it worked out much to my advantage, since I have mostly slot players. People who have for instance mostly Blackjack players – it wasn’t to their advantage.
What Rewards did back then is switch to the same accounting methods that brick and mortar casinos use. Whether the player wins or loses is irrelevant, so whatever you see is what you get, there are no winnings to subtract. The accounting only counts how much is played… They also didn’t make this change forced, you had the option to stay on the old method.
That said, yes, they do send out mails with bonuses to players, and on the bottom of the mail they have CLICKABLE links to all their other casinos.
IMO that is not fair, they are openly luring players away from existing affiliate accounts. That is the beef I have with them.
In some 10 years or more of promoting them, I have never found any accounting irregularities though, and they convert well. So personally I decided to keep them on, albeit with lower exposure.
I wish they would make these images in their bonus letters NOT clickable. If they did that, I would recommend them without hesitation. As is, I don’t.