Google publishes how to control their bot - with robots.txt. They then obey those instructions. Google also takes some effort to not use all your bandwidth. Google isn't perfect, but they are at least making a "good faith" effort to be nice and this does count in court. Overall most will agree that in general what google does to allow people to find their website is worth the things that google is doing.

You can of course argue a lot of edge cases if you really want. For the most part I want to say "it isn't worth the argument". In some cases I will take your side if I really have to think about it, but in general the system google has been using mostly works and is mostly an acceptable compromise.