It's Google they are very good at data analysis them needing to use 1gb of data to know about you are doing on your phone is an idiotic assumption. They could probably do it 5 mb only. My bet is they are counting Google photo uploads to get the 1 gb figure.

Maybe you should ask yourself "how much data is 1gb times the number of android users?" and "how big is Google's datacenter?" (hint: the first number is bigger by a factor of 5)