A lot of rationalization for what is fundamentally just market inefficiency: economies of scale and network effects (aka Monopoly).

Remove Google's monopoly level distribution, and then build that feature and tell me how much revenue it generates.

The value is in the monopoly which was formed by the founders and all the early employees by having the right products at the right time decades ago, not in the "upgrade now" button some worker bee added to Gmail in year 25 of the company.

Yes, that "upgrade now" button probably does generate $100M in revenue per year. But the reason why isn't because of some unique engineering talent on behalf of the worker bee.

They just pay that dude so much because activist investors don't scrutinize costs too aggressively on growing monopolies (wait until revenue growth stops) and they value stability. If you don't value stability to the same degree (you aren't a massive 200K employee org), I wouldn't hire the "upgrade now" button guy.