A non-trivial amount of Boston Dynamics' funding came from DoD. Pretty sure Google was not interested in sustaining those contracts but without them it was likely a net loss.
Google knew that going in. Even if it hadn't been public knowledge (it was), it would have come out during due diligence.
There has to be a different reason, we just can't tell what it is.
My assumption is that the tech makes good videos, but is basically limited in what it can do, without someone always offscreen handling the controls.