Mark Cuban says crypto lacks a killer app, NFTs will stage a comeback, and billionaires should pay more tax. Here are his 6 best quotes from a new Q&A.

• Mark Cuban says it takes luck to become a billionaire, and the super rich should pay more taxes.
• The "Shark Tank" investor says crypto needs a killer app, and NFTs will stage a comeback.
• Teaching people how to make full use of Alexa and ChatGPT is a lucrative opportunity, Cuban says.

Mark Cuban underlined the role of luck in becoming ultra wealthy, called for the super rich to pay higher taxes, and revealed how he would make money from scratch during an episode of Wired's "Tech Support" released this week.