I think that bet was just to attract other bettors to follow him and I'm sure a lot of them did just like that as sheep effect can be huge sometimes , especially if a superstar promotes it. Personally, I will never follow someone known regarding bets because they can afford to lose and also they're doing for entertaining and maybe for the bookies but wagering with BTC in that amount it's just wow and I'm sure he has a lot of cryptocurrencies if he made that bet.
Overall , it was a great promo for both BTC , Super Bowl and even bookies as well and a bad one of gamblers haha.
Definitely, if he won that huge amount, he maybe had big losses as well. But not many gamblers will show their losses, usually, they only post when they win big. It is true that it can attract more bettors especially to the bookie that he used. But as a gambler, don't chase what Drake's got, because not many can follow such luck and also he can very well afford to bet big because he has that amount to begin with. So even if he lost the bet, it maybe nothing for him but for regular bettors, it is already their lifetime savings.