Fintech has been a key startup story in recent quarters, with leading players in the genre raising titanic rounds at eye-popping valuations. Consider companies like Robinhood, and its epic capital run this year on the back of huge revenue growth, or Chime, which also raised huge sums while riding a tailwind provided by the savings and investing boom. The Exchange explores startups, markets and money. Read it every morning on Extra Crunch, or get The Exchange newsletter every Saturday. As you can imagine, all those mega-deals have added up. According…