I recently deleted my instagram account after noticing a steady drop in the frequency of new posts from friends. However I always used the browser version and I

I recently deleted my instagram account after noticing a steady drop in the frequency of new posts from friends. However I always used the browser version and I was never served a single ad. Maybe this was because I was in some long lived experiment group (unlikely) or maybe because the mobile web app doesn’t have ads (also unlikely). I’m curious the reason.