Also for wealthy people this practically doesnt apply. We have a flat 25% tax on income from financial investments like stocks. So while the engineer at BMW is paying 42% on all his income above 66,000 the Quandts as largest shareholder pay 25% on their roughly 1,000,000,000 dividend they receive every year.
Considering loopholes and tax evasion shemes billionaires are among the least taxed people in Germany.