Castbox is a Hong Kong-based podcast company. The company both hosts, and produces its own podcasts.
With over 10M downloads, I have a method to get any user's email, if you want the method, dm me on telegram: https://t.me/Ya_sr_RU
I will post 98k email I have scraped in a day to prove that it is real:
https://drive.proton.me/urls/CEGVZTK66R#JejmlFzew099