How do you counter Bill Gates’s statement about crypto being worthless?

“The value of companies is based on how they make great products,” he wrote.

“The value of crypto is just what some other person decides someone else will pay for it, so not adding to society like other investments.”

Moreover, Warren Buffett (this sub's favourite investor) said:

“Whether it goes up or down in the next year, or five or 10 years, I don’t know. But the one thing I’m pretty sure of is that it doesn’t produce anything,”

What do you say to that? What actually makes crypto useful to the world? Going against the beehive here, why are their opinions valid or invalid?