That is one premise in the film version of Piketty's Capital in the 21st Century.
The inequality in the distribution of capital that has been increasing since the 1970's, while wages stagnate, is at worst a trajectory that takes us to neo-feudalism, or something that resembles slavery, colonialism or caste systems. At best, it's a long-term recipe for social unrest.
FAANG is sitting on vast amounts of capital. Though FAANG employees may loathe the thought, it is arguable that, in the end, the market value is not based on the workers, it is based on the capital. Time will tell.
The relatively high salaries can be viewed as a protective measure to keep these workers from joining competing companies. We already know the FAANG CEOs, e.g., Steve Jobs, made pacts with each other on how much they would pay out for these workers.
The film suggests workers have become liabilities not assets. Workers are costs that can be cut when needed. You can decide for yourself, but when pacts are made to limit salaries, this to me sounds like limiting a cost, not limiting how much they will pay for an asset.
Taking a long view, thinking beyond simply my own welfare, I would have problems ethically working for FAANG. I do not see these companies as contributing anything towards solving the problems we are going to have as a result of the trend to which Piketty has drawn attention. If anything, these companies will be on side of capital not labour, and the "work" they do can be used to keep labour under surveillance and control.