I think that player satisfaction should be number one priority for affiliates.
If the players are unhappy with the casinos you send them to, then they will stop taking your advice in the future (not to mention, that they won’t be playing at your casinos, or that it’s just plain wrong).
From what I have read, it seems that FL had closed 4000 accounts because players took the bonus offer and tried to come out winners in a way which does not break the T&C. There seems to be no abuse, as the players tried to beat the casino and their bonus offer, which is just fine in my book, and probably in the book of every normal person.
As long as the casino bonus is advertised as “free money” I think it’s fair for people to do the best they can to get the money for free, don’t you? There is a better way to control the bonus money, for example, wagering on roulette not to count towards fullfilling wagering requrements.
I think every affiliate of FL should be concerned, and keep an eye on that thread.