"MLB asked Nevada to stop taking bets on spring training games. Nevada said no"
WaPo:
"These games are not conducive to betting and carry heightened integrity risks, and states should not permit bookmakers to offer bets on them,” the league said in a statement
...
“Based on our history and experience in regulating sports wagering, we are not inclined to prohibit our licensed sports books from taking wagers on MLB Spring Training games,” it wrote in response, again according to Purdum. “We have a common goal to combat sports bribery and maintain the integrity of your sport, and are available to discuss ways we can work together in this effort.”