Think of #monster as a filter on the wider porn caption caption archive: same submission pool, but slimmed down to the exact register you searched for.
You'll see fresh drops from the last 48 hours, veteran porn caption classics that still pull views, and the tag-graph neighbors people click through to next.
Because #monster is tag-locked, the recommendations under each post also stay in the same lane, which means fewer 'that wasn't what I wanted' clicks and more time on the actual fantasy.
As more creators publish under #monster, this page rebuilds itself daily with fresh title, alt, caption and tag combinations — meaning what you saw yesterday is not what you'll see tomorrow.