Forbes estimates Michael Bloomberg is one of the few worth more than $100 billion. He doesn't appear on Bloomberg's rich list due to editorial policy.
His wealth has roughly tripled from $35.5 billion in 2015, making him one of only 14 people worth more than $100 billion by Forbes' reckoning. Excluding his fortune leaves a sizable hole in the Bloomberg index.
As I said in another comment, illegal /= unethical or immoral. Most people on the list used shady, yet legal, practices. Few probably engaged in outright illegal acts to obtain their wealth.