NAL, but surely they put something in the ToS that says you aren't allowed to do that. And even if you're 100% sure it's unenforceable, are you willing to defend your company against Google's army of lawyers? Scraping data from the web may be legal in many places, but that says nothing about what you're allowed to do with that data (hint: usually not much unless it's your own user data).
Having said all that, I've done this in the past for a few side projects where I wasn't selling anything and knew they would never in a million years get big enough to attract Google's attention. For those, this is definitely a good way to get 3D data (along with OSM Buldings, if you don't care about realism and just want a good approximation)