anche ler le Google Maps vedo che non c'è alcuna restirzione di utilizzo tranne una:

Usage Limits

For-profit web sites are permitted to generate up to 25 000 map loads per day using the Google Maps JavaScript API v3. A map load is counted when a map is initialized on a web page. User interaction with a map after it has loaded (eg. panning the map, zooming the map, or changing from roadmap to satellite map) does not have any impact on usage limits.

In order to ensure that sites which experience short term spikes in usage are not adversely affected by the Maps API usage limits, only sites that exceed the limits for more than 90 consecutive days are subject to the limits.