https://siftrss.com

If your RSS feeder doesn’t allow you to filter out keywords (looking at Reeder on  Devices), this service allows you to exclude content.

I personally use it to remove ads, sponsored articles and articles about Trump/Elon. For podcasts, I used to remove both sponsored podcasts and episodes featuring the word trump or Elon.

If you find the service useful, the creator has a BuyMeACoffee Page here: https://www.buymeacoffee.com/siftrss