I do not think Stake is using it to advertise because we have seen Drake lost money many times on Stake gambling site. I remember he bet on his country, Canada to win a match and he also lost. That was the last time I heard about him losing but he had consecutive losses.
If he is still Stake ambassador, it will still be promoting the gambing site but not because he won.
If he's that Stake ambassador then that alone itself will already be considered to be an advertisement on which considering the popularity and fame of Drake then that would really be that a good exposure.
Doesnt care that much whether he had won or lost up $40M on this one on Stake on which no one really knows whether its a real one or not but just like on what most people know on here specially on gambling field that Drake is a heavy gambler on which this one involves hundred thousands of dollars on the bets he had been doing in the past on which if ever we do able to hear up these wins, then its not actually that shocking at all or really just that simply that an ordinary day for Drake. It is really just that we dont really get used to these bets considering that this is really that a life changing amount for money people.