"The unpleasant and unacceptable face of capitalism" to quote former Prime Minister Edward Heath. And back in his day capitalism was far less unpleasant and unacceptable that, at it's worst, it is today.
Given their track record I think if my employer was taken under the wing of Greybull or any other of the venture capitalist sharks I'd be jumping ship PDQ - they're in it for themselves and their gain, never for the long term benefit of the employees.