I've steered well clear of anything that says "Bingo" or "Casino' or "Slots".
I have played other games on my phone though to earn credits.
I currently have about 10,000 and have spent another (approx) 6000 on clubs & balls, so I guess I've earned about 16,000 in credits from playing games on my phone.
I have short amounts of spare time during my work hours and can play for 5 or 10 minutes to progress through the games.
I have tried playing golf on the phone rather than my desktop, but I really struggle with the small screen.