How does this differ from other organizations? Places I've worked or interviewed at outsource things like cleaning offices or running the mailroom. Are you saying that Google has their own employees do that stuff, but they are a separate class/caste?
Does Google also have significant numbers of temps from staffing agencies, or other contractors?
That's (part of) my point: Google isn't some egalitarian techno-utopia.
You could, say, have a policy that the lowest-paid employees have a floor of 1/7th the pay of the highest-paid employees, like the janitor makes $100k and the CEO makes $700K, or whatever.
If they have low-paid employees in house where other companies don't, then their stats on inequality could look worse while in reality, there is less inequality.
Does Google also have significant numbers of temps from staffing agencies, or other contractors?