The big asian bookies don't ban you if you win, they use your sharp bets to improve their price accuracy. Not legal to bet on them if you're from the US though (land of the free??).
The biggest betting syndicates use platforms like Punterplay to place bets (often via API) at multiple bookies (Pinnacle, Singbet, SBObet, Betfair, Matchbook, 3ET, VX etc) at the same time.
In a somewhat ironic turn of events the more regulation you have, the worse it is for the customer. Big regulatory burdens require the bookies to extract more from the users, making the offerings more predatory. This is also why the likes of Kalshi can provide a better product to customers at the moment - because they ignore all the regulation.
Casinos have a ton of leverage in some states. Here in Nevada MGM and Caesar's and Wynn, thanks to their expansion, are effectively treated as too big to fail and given huge amount of deference in how they operate by the gaming commission. But there are also incredibly problematic protectionist regulations that I and several other residents who didn't really know each other tried to get rid of through the admin law process, primarily allowing remote signups which would also allow out of state entities to set up shop without literally having a physical casino. Having to physically go to a casino and sign up in person was onerous and clearly pointless, and then impossible during the pandemic, and became a really silly charade. What was supposed to start as public meetings right before the pandemic got dragged out, meetings would get rescheduled at the last minute, and casinos made entirely spurious rationales like "there aren't enough local datacenters" (Google Cloud's Henderson datacenter is surely sufficient for in state traffic?), that they would want taxpayer money for potential loss of revenue (capitalism dude, what are you afraid of?) Meetings would get scheduled in Carson City and that's literally six hours away by car. Agenda items would suddenly be altered. It was a hot mess. We managed to get iGaming in theory legalized but they straight up never even pretended to start working on regulations for it, and now with the 90% loss deduction limit by the IRS on the OBBB books basically have 12.5% house edge on any line to start if it's properly priced. My model can beat 2.5% but 12.5% is insane. If the feds are going to ban pros constructively, well, I can't out lobby a casino. And the pro betting constituency isn't big enough to pander to, frankly. If there's action, it can't actually happen on shore. I realize that "people who can beat the books due to specialist knowledge and can bankroll drawdowns to the extent that returns long term profit" is also publicly not sympathetic and generally people either think we're touts (if it makes me money touting absolutely won't help me, in fact the fewer people I have to interact with the better) or something. Wagering by hand sucks, but no model is perfect, just some are more useful than others, and someone in accounting may be able to figure out that ban or bankrupt is not a sustainable strategy to run books. But with the feds involved to put that imprimatur of authority in writing, I guess I'm never getting my limits lifted. Good luck finding stable liquidity elsewhere.
In a somewhat ironic turn of events the more regulation you have, the worse it is for the customer. Big regulatory burdens require the bookies to extract more from the users, making the offerings more predatory. This is also why the likes of Kalshi can provide a better product to customers at the moment - because they ignore all the regulation.