Your suggestion is actually a great idea, and I think it would benefit many gamblers who can’t monitor their bets most of the time. It provides a touch of convenience and helps players lock in profits without being attached back to their devices.
Well, at the same time, I feel like some casinos seem to be applying this indirectly by offering early cashout options but like having an automatic cashout feature would take it to the next level similar to take profit orders in trading. 

I believe this could also promote responsible gambling since players can set realistic hits and walk away with winnings instead of risking everything. It’s definitely something casinos should consider implementing to enhance the user experience playing differently than traditional ones and give gamblers more control over their bets.