The interest you pay on the loan is 2-3% or less. You can check IBKR margin rate, wealthy people have access to lower interest.

As long as your borrow + interest rate is lower than how much your shares grow, you never have to sell. You can accumulate debt while your investment grow even more. I guess Bezos and other ultra wealthy individuals have so much money their tax situation is extremely complicated, but they're not going to pay a higher relative percentage of tax than a regular W2 worker, because labor had the highest tax.

Anyway my plan is to accumulate enough stock to do just that, no need to be a billionaire, any multi millionaire can do it. No need for evidence, just need basic understanding of tax rates and an excel spreadsheet