I've found out how to win at sports betting:

Choose a side of the spread and bet $1,000,000 on it.
Wait for spread to change dramatically.
Bet $1,000,000,000 on the other side of the spread.

Now you're wondering, what about max bet sizes?
Develop a network of employees around the world, betting in casinos or sports books everywhere.
Have lots of money in their accounts, ready to bet.
Send out group texts and have everyone make simultaneous bets.

Profit.

It's important to note that the $ figures are exaggerated. Also, this strategy has been used successfully.