you only have to research terms like gnome farms, q-wager , casibot , what vm ware does etc to know why bonus abuse has caused casinos to be a bit gun shy, particularly in places where creating bank accounts and new indentities etc is much less stringent.
it wasnt that long ago the perfect strategy play on many games was a licence to print money and realise why alot went down the path of fraudulently creating many accounts
golden palace used to have a bonus that you deposited 100 bucks that would mathematically deliver an EV of $260 with a few hrs work
this was low hanging fruit , there are still many advantage players that make good money exploiting casino loopholes