For curiosity sake I've been testing out the various pay to game apps recently. Cash Alarm I've figured out I can make around $1.50-$2.50 per hour most of the time and it's quickly deposited to PayPal when you cash out.
Mistplay is drastically different in good and bad ways. After messing around with it for a week I'd estimate you can make between $1-$1.50/hour of gaming. Neither are really a career or job move but it is nice to get a little cash back if you are into mobile gaming.
If you'd like to try it out, hit the above link. If you join up, I'll receive approximately 12 cents worth of points so the referral value isn't too high here.
Mistplay for Android has a really sleek and modern UI and also a very wide variety of games to choose from including some that I already play. The payouts take longer to build up than places like Cash Alarm but it at least includes better games. Mistplay also works as a credit back rewards system where you get credit for in game purchases.
If you already play games like Star Trek: Fleet Command or Raid: Shadow Legends and ever make in game purchases, its not a bad idea to load up the game through Mistplay and at least get a little money back from the purchases.
Mistplay pays out in the form of credit from Amazon, eBay, Virtual Visa, PSN, Google Play, Uber, Xbox Live, GameStop gift cards, iTunes, Starbucks and more.
Mistplay seems to have a lot of potential but the payouts are slow and low. It's still not a bad option if there are games you already enjoy that are on it though. Referral options are pretty limited. You definitely can't earn an income from this or most of these but might be worth it just to get a little cash/credit back from stuff you already play.