So then the Google calander API has always been used, but the data is delivered in CalDev format?

This move would then represent Google refusing to accept that format?

I didn't read things that way.

It makes good business sense - look at Maps API. You can get X number of free calls, but if you go over a certain limit you need to pay (That limit is pretty high if I recall)

So now fast forward to Microsoft and Others incorporating that API into their products - am I understanding correctly Google could charge for API calls similarly?