First off, I have my feed order set to chronological. What I'm noticing is that posts completely ignore this setting and repeatedly filter up to the top of my feed.
Note that I'm not talking about run/bike/swim/etc activities. I'm talking about posts, like when a pro athlete creates a post on their feed to promote their latest YouTube video or sponsorship, etc.
I'm forced to read it every single time I open Strava. I'm assuming it's because the post gets a lot of engagement, but I have my feed set to chronological for a reason. It's because I don't want an algorithm to decide what I see and I don't want Strava to turn into Facebook or Instagram.