In general people overestimate how hard it is to make money in gambling. You don't need to be some kind of savant to do it. The people in general are similar to what you would find in your average tech company. Sure there is a founder with a vision and some sort of an insight into making money, but every company has one.
I'm on a bit of a probability (gambling, sports betting, stats, etc) kick these days, and I'd be interested in reading more about people and companies doing this in practice. I'd been imagining there must be organised sports gamblers, but they don't seem to be overly searchable.
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These companies are known more for their HFT trading in financial markets, but I believe they have also expanded into sports betting.
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Also some of the bookmakers such as matchbook have started as betting group and then overtime turned into a bookmaker as that is where the real money is.
Internally they track how much each account wins & loses. If you win too much, the site gives you worse and worse odds until eventually you’re banned entirely. The reverse is also true: if you’re a terrible better, the site gives you better odds hoping to keep you coming back for more.
They have a whole team whose job it is to instantly block smart betters from opening new accounts. Accounts opened in the name of their girlfriends is the classic thing they watch out for.
Some of the smartest gamblers also get hired as quants, and help figure out what the odds should be on the site.
In Asia the bookies are a lot more tolerant, especially the larger ones. You really have to hit their pnl hard for you to get cut off.