I wrote about the robo-pet everyone will want, on 'ere, yesterday.
I think that is almost certainly where Goo Inc sees this going. The more (innocent looking) sensors you have in the field, the more you are likely to find out.
For a long time I have wondered why a pair of individuals would - way back when - need to come up with a company slogan of "Do no evil"?
Even tobacco companies, who apparently knew of their guilt long before most folk, didn't feel the need to protest their innocence quite so early, quite so loudly and for quite so long.
The greatest danger - to everyone else - from IT companies, is the geeky desire to do something just because it can be done.