Thank you for using cordova-googlemaps-plugin.
You can use this plugin in your application for free or business. However you need to follow the terms of service. This plugin has Apache License Version 2.
And you need to follow the Google Maps API Terms of Service
Additionally, you MUST include the license attribution text as part of a "Legal Notices" section in your application. Including legal notices as an independent menu item, or as part of an "About" menu item, is recommended. This is required by Google Maps Android API v2 and Google Maps SDK for iOS
How to implement to you app? Please read the Map.getLicenseInfo()