I am more on the idea that Drake posted this as spur-of-the-moment thing.
Not asking or anything on that regard to promote the casino involved.
But with the publicity that stake got from Drake. Who knows, stake is already thinking of getting Drake as part of their celebrity endorsers?
For his followers, they should definitely think if they can follow his lifestyle because not many can bet such amount without the possibility of losing it all.
I don't recommend Stake to get Drake as one of their endorsers, Drake has a gambling problem he can bet a huge amount of money because he still can make a lot of money as a concert artist and he also admitted that he has a gambling problem, it's against what Stake.com preaches in their TOS about responsible gaming.