BD was once under Google/Alphabet's control - then they let them go, what does that mean? Was their robotics efforts not useful to Google's own research branch?

BD was once under Google/Alphabet's control - then they let them go, what does that mean? Was their robotics efforts not useful to Google's own research branch? Did acquihired the talent and then resold what was left to SoftBank? I have no clue...then SoftBank sold it again.. What I know is surely BD must have gone through a lot of turmoil (acquisitions) for such a small company (300ish employees?) since its inception!