It would also mean that sufficiently rich people pay only 5% taxes on their income.
Also, this kind of progressive tax reduction should only apply after the company is public. So the clock for VCs, founders, etc only starts at the time of the IPO.
This would ensure all the early stakeholders are also aligned in investing in the long-term success of the business.
Currently, these early stakeholders are more likely to be focused on cashing out and having a liquidity event.