On Youtube they have 412,000 subscribers - and 0 income.
On Odysee they have 73,000 subscribers. IDK if Odysee pays dividends to its content generators, but if they do, I suspect it would be a smaller fraction than YT can afford to pay. Odysee is still a start-up, as near as I can tell from their performance. I suspect Bret and Heather are making much more money from book sales than from their podcast.
Perhaps you should ask RFK Jr. He has a book about Fauci available for pre-publication purchase coming out in November, called "The Real Anthony Fauci".
The Real Anthony Fauci: Bill Gates, Big Pharma, and the Global War on Democracy and Public Health (Children’s Health Defense) https://www.amazon.com/dp/B08X5YWRRP/ref=cm_sw_r_cp_apan_glt_2GEA7AX44SHSCTGFTNCR?_encoding=UTF8&psc=1
He talks about the book and more in this interview: