Actually they did ask and it was written into the license agreement that Google Sketchup 8 non pro was licensed for commercial use.
The fact that Google gave it away free so that people would populate google earth for them, (in other words work for google for free) in no way suggests that Trimble should do the same. Trimble supplies a free version for hobbyists, not for business. If you earn money from it you should pay for it. I never understand how people fork out the money for hardware but balk at paying for software.