As far as I understand, the reason why Google sold Boston Dynamics was not because it wasn't able to make a profit, but because the obvious way how it would make a profit - military contracts - were not considered strategically acceptable.
Except the military rejected Boston Dynamics for being too loud - I'm not sure of the timing of that decision though so that very well may have been determined after Google sold Boston Dynamics.
Also this reason rings hollow with some of the other stuff Google has attempted with doing business in China.
