https://mapsplatform.googleblog.com/
https://cloud.google.com/maps-platform/user-guide/
https://cloud.google.com/maps-platform/pricing/sheet/
Based on your project usage over the last 3 months and our new pricing plan, we estimate that your new cost will be less than $200 a month and will be covered by our $200 monthly free credit.
So you will not pay anything unless you get more traffic.
You can switch to OpenStreetMaps if you like at GD > Design > Maps tab > Select Maps API
Thanks
Fantastic [sigh of relief] thank you for that info, just tried it very simple and straight forward.