I put "MLB and betting" into the Google search box and I got a long list of links from places like DraftKings Sportsbook, The Action Network, Vegas Insider, BetMGM, Covers.com, Odds Shark, VSiN, Sportsbook Wire, SportsBettingDime, Simplebet, SBR, etc., etc. There are lots of places where a fool can part with his money.
There have always been such places. The difference today is that betting on sports, and baseball in particular, is now actively encouraged and enabled. The powers-that-be WANT you to bet on sports!
MLB is the latest entity to hitch a ride on the Great Gambling Train.