Bloomberg (in a long article that's mostly about the percentage of gamblers that suffer devastating results, and possible tactics to reduce those outcomes while keeping money flowing):
Among the main challenges for a pro bettor is finding places that will take your money. If you show signs of being good, or even just highly methodical, most sportsbooks will drastically limit how much you can wager.
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“If I open an account in New York, maybe for a few weeks I just bet the Yankees right before the game begins,” says Rufus Peabody, a pro bettor and co-host of the Bet the Process podcast. If this trick works, the book sees these normie, hometown bets as a sign that it’s safe to raise his limits.
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“One pro bettor I know set up a bot which logs in to his accounts every day between 2 and 4 a.m., to make it seem like he can’t get through the night without checking his bets.