>>105146>It's clearly a thing people are into or it's being spammed.
It's both, in a positive feedback loop. People spam it because even if you're not particularly triggered by it, it is assumed to trigger 4chan's demographics like no other. Then legitimate fetishists find themselves in good company and are basically given their kink on a silver platter, with plenty of troll/ironic LARP that they enjoy unironically. It's been a thing on /b/ for god knows how long with tons of fetishes, always getting more obnoxious over time.
It's kind of like how /qa/ has anons that unironically enjoy making threads dedicated to repost wojak battles. Some do it because the know it is grating, some do it because they generally find reposting wojaks to be like a game of cards, and there's probably a bunch of overlap.