A lot of small, shitty subs are popping up on r/all lately, I've noticed. I used to doomscroll and only notice I'd been too far when I started seeing stuff from subs I'd never seen before, like r/artefactporn, r/justguysbeingdudes, or that weird Talylor Swift circlejerk sub. That was usually around pages 7-9, somewhere in there. That was the sign that I'd been scrolling for too long, and probably ought to either touch grass, or at least refresh the page.
Right now, for me, all three of those subs are on the first page of r/all, along with other subs I've never seen (or rarely seen) before the bottom of the barrel, like r/newsofthestupid and r/rabbits. The one from r/rabbits is on the bottom of the front page with less than 1500 upvotes.