Hi Rob, in that mail I got from Google ([Action Required] Changes to your Google Maps APIs account) they wrote: "For additional visibility and control you can set daily quotas or billing alerts." - so there will be a kind of control system. So far I couldn't find more informations about that.
...and yes you are right: this was a very short and surprising notice from Google. So if your map application in future will reach the new limits and you are looking for an alternative mapping application - Leaflet is pretty nice and open source. -- You received this message because you are subscribed to the Google Groups "[deprecated] Google Maps JavaScript API v3. Please use the latest post." group. To unsubscribe from this group and stop receiving emails from it, send an email to google-maps-js-api-v3+unsubscr...@googlegroups.com. To post to this group, send email to google-maps-js-api-v3@googlegroups.com. Visit this group at https://groups.google.com/group/google-maps-js-api-v3. For more options, visit https://groups.google.com/d/optout.