They care a bounded amount.
A rough approximation of how much they care would be the rational incentives to not produce a culture of fear in the regular workforce + the amount of being nice to employees that Google can afford due to their dominant market position.
Similarly, when I shop for employers there are fringe benefits, cultural differences, etc that matter - but they aren't going to matter in the face of another $100,000 in salary.
Definitely wouldn't go somewhere else for a few hundred bucks tho.