Something that has come up in my district -- and something that causes me some concern -- am I as a teacher using Google TOO much, and if so, am I crossing ethical boundaries when I do?
Google, as all search engines, make their money from advertising. Thus using Google (or any other product supported by advertising) products exclusively with my students might very well be crossing ethical boundaries.
I even wonder that sometime when we use Microsoft products exclusively, even if the district paid for them.
Google has several products available to educators that you might find of interest to use yourself or with your students.