[s1artibartfast]

This was my take as well, and I dont know how people who listened to the interview get it so wrong.

He basically described how you can make transaction fees or arbitrage fees on others engaging in speculation.

A very dumbed down example would how the post office can make legitimate income on postage while someone else operates a Ponzi by mail schemes. Or for that matter, brokerages take commissions when people trade meme stocks and unprofitable companies every day.