Maybe check your network isn't sending web traffic you're not aware of?
I'm running firefox and seeing the normal amount.
Every so often, usually after a firefox update, CF will get into a "I'm convinced your a bot" mode with me. I can get out of it by solving 20 CAPTCHAs.
Most people are on a CGNAT these days, drowning in captchas is the new normal. You’re at the mercy of one of your neighbors not hosting a botnet from their home computer.