Throughout the past two decades, American billionaire wealth has increased from $240 billion (adjusted for inflation) to $4.18 trillion in March 2021. That's 17 times more than their total wealth in 1990.
If you can believe it, there's a huge wealth gap even among billionaires. The majority, 94%, are worth $10 billion or less. After that, 5% are worth between $10 and $30 billion, while mega-billionaires — who comprise less than 1% of all billionaires — are worth more than $30 billion.
And there are "evil" billionaires. The billionaires mentioned here are from the western world. In some countries (i.e. UAE) billionaires treat their workers like slaves. I admire Elon Musk very much for what he achieved, it's almost superhuman but contribute to society by paying taxes!