Once a company reaches stratospheric valuations, it should be nationalized, after paying a fair value to the "owner", similar to how Norway's Sovereign Wealth fund nationalized oil. Distribute the ongoing revenue stream to promote the common good, rather than the useless eaters at the top.

None of those billionaire/trillionaire businesses would be possible without the massive collective investments of individuals and governments in education, research funding, infrastructure, etc. Society deserves a better return on that investment.