I think calling them an undercover casino employee is too much.
My older sister has worked in a gambling casino, and it's like you said. The women there are just work and nothing more than what people say about the work they do. In addition, the task of assisting gamblers is also not as easy as imagined.
Not all gamblers are benevolent, sometimes they ask too much to be served. And not a bit of friction between the casino guards and the gamblers who came once and made a fuss.
As a woman who works in a gambling casino, my sister works according to her rules and professionalism as a guest waitress to be able to gamble longer in it.
Many will be interested to work with sexy online casinos as the salary is good, I guess I watch some documentaries before about sexy online casinos that are operated in Asia even hiring minors to make the site more appealing, and these gamblers have controlled the government of poor countries, so they can get what they want. We just see them happy serving us but we don't know the reality behind the camera.
In this current situation where the gambling business is getting bigger, the competition is also getting tighter, so it's just normal to see some casinos adopt with the new trend to attract gamblers.