Yep. It’s possible… at least one guy has done it and the story is wild:
How to Make Millions as a Professional Whistleblower [GQ] – “A little-known provision in US law permits anyone to blow the whistle on financial fraud—and potentially take home a percentage of the funds collected. One undercover sleuth has made a wild career out of it.”
Another gem of quote – “Damning information, Overum says, is surprisingly easy to tease out of a conversation. Nobody expects to meet with a would-be whistleblower. “Their guard is down because they think I’m an investor. I’m like an undercover cop in a world where undercover cops don’t exist.”