I have created a few tutorials for adding support for Google’s Firebase framework to JUCE iOS and Android projects. This will allow you to monetize your iOS and Android Apps written with JUCE.
They are in the playlist on Youtube here: https://www.youtube.com/watch?v=614Sxootyw0&list=PLL4Pwd7fD7npBIpgp6Hwzod1PkjsbI0dW&index=2
You can check out the repo that results from the videos here: https://github.com/matkatmusic/AdMob