I remember reading a book called The Power of Habit, which isn't about gambling, but includes a story of a gambling addict in America. The casino knew she was a problem gambler, and constantly contacted her with offers of free suites, food, at one time even providing a limo to bring her to the casino and gamble. More importantly, they gave her credit. In the end, she'd gambled away over a million dollars of her inheritance, taken out a secret mortgage on the family home, and owed the casino nearly $400k, because according to the court "there is no obligation for casinos to avoid targeting problem gamblers."
Problem gamblers in particular react differently to near misses in a game. Most people when faced with a near miss will see it as a trigger to quit while they're ahead. But problem gamblers will get a hit of adrenaline that keeps them going. So how have gambling companies responded to these findings? Well of course they've programmed their "random" games to provide more near misses and keep addicts playing longer. They are even able to collect data on individual players' habits and adjust the game accordingly. Which makes a mockery of the idea that they don't target addicts. In America, 40-60% of slot machine revenue comes from problem gamblers, and people who play slot machines are more likely to become addicts than those who gamble in other ways, precisely because the machines are designed that way.
It would hardly be astonishing to find that gambling apps aren't similarly designed to target individuals' habits and provide them with the exact stimulation they need to keep gambling. It's therefore also unlikely that such apps are incapable of identifying problem gamblers based entirely on their gaming habits. Which of course could be used to prevent harm, but instead is used to extract as much money as possible from them.