I think not streamers are not loyal to what business they are promoting not unless if they have lifetime deal with those casino. Maybe they might just give their best to promote their current clients since it can affect their credibility as a streamer if they don't give good return of service on his past clients and they are not satisfied with their service provided. If their contract end for sure they go to other casino that pays them more better also maybe after the contact ends on past clients they might delete all or some of those video contents which they are just over exaggerated on their promotions and only leave those video which is mild and not doing any harmful contents. Drake is influential guy he surely have long term contract with stake so provably he will say always good about the casino he promotes.
Yes, I think the same, of course streamers like Drake are very influential and they themselves attract a lot of community, just one day at night, Drake was in a casino playing on stake.com, and the number of players who were there was impressive, I don't know if you were there, but the point was that to participate and if Drake gave you 1000usd you had to register your phone number and account name in the stake.com forum, from there you just had to be present to watch the streaming and that's it, Drake just called the winner on the phone and told them that he would credit the $1000 to the stake.com account amount, so these types of things are what motivate many to follow streamers of his style, I know there are many streamers who don't have Drake's level or community, but I've seen that they are much easier to convince to work for any site, even those that aren't as trustworthy, so it's a question of loyalty at the end of the day, well That's how I see it.
The business have a lot to do with costumers generation that will boost the casinos revenue that way even when they pay the streamers any amount they will be sure to generate twice that amount from the clients that comes onboard via the streamers activities, just like Drake that you mentioned, you can see how huge his followers are and what they are doing at stake on daily basis, although aside from just watching the stream and winning a potential $1000 you may also have to register using the Drake link if you are not registered on the casino before, by that, Drake generate percentage on every wager you does since the customer is registered under his affiliate links.