As of July 16, 2018 Google has implemented a pay-as-you-go model for its Google Maps API where you get $200 free usage every month for Maps, Routes, or Places. You have to associate a credit card so that you can get billed if your site has requests that exceed the $200 credit they give you monthly for free.
If you exceed the $200, you will see a "For development purposes only" watermark:
It should also be noted users will be required to obtain new API keys, and use them to replace existing keys.
As a reminder of where the Google Maps API Key is located within Yellowfin so that it can be replaced:
Administration > Content Settings > Chart Settings > Map Settings > Google Maps API Key:
For more information, see: https://cloud.google.com/maps-platform/pricing/