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Unfortunately, the feeling of gambling is what they make addicted, in addition,
casinos invest in research and development about how to put more players getting sucked into the game. ~
Do you have any evidence of that? Or do you mean that trying to make your product better is automatically implies making your customers addicted to your product? Then everyone is guilty, every company like Coca-Cola and others. Is that what you mean?
That is the bare minimum for gambling-related company. See the book of Addiction by Design: Machine Gambling in Las Vegas, I haven't finished it yet, but, you get the gist. I mean making player spend more time in the game is within the motive of those company. Gambling industry itself is competitive space, who wouldn't make their own casino extract more profit compared to its competitor?
Schüll describes the strategic calculations behind game algorithms and machine ergonomics, casino architecture and “ambience management,” player tracking and cash access systems—all designed to meet the market’s desire for maximum “time on device.”
I know what the author describe the non-online gambling acitvities, but, there is no reason most parts also applies with the online one.
The word "better" requires a context, drink or social media company generate profit by their own buyers and users, mind that social media do try to increase user screen time and sugar is also addictive. This might causes an indirect consequecnes, but that does not close the possibility the company itself investing in shady practice.