I have had very good luck with Rewarded Play, although it has changed some since I started. I wrote an article after my first month ($60!). It for sure isn't worth it compared to side hustles that generate real money at an hourly rate or better yet passively, but depending on someone's budget it could make a big difference. I've made about $400 total over about a year and a half with Rewarded Play. In the same time frame MistPlay got me maybe $40. Here's my article about my $60 in 30 days: https://medium.com/@sarah-nicole838/i-made-60-in-30-days-playing-games-on-my-phone-d78d7c01b984