>>2050273Because they're unoriginal memer immigrants from reddit that likely heard of 4chan from /pol/ and treat this site like a social media meme platform where they dump shitposts in order to get (yous) and generate dank material for /r/4chan reposts. They refuse to lurk moar. They proudly use the same image folder on whatever board happens to have the misfortune of hosting them. The concept of board memes that AREN'T Pepes is foreign to them, and they'll try to rectify that issue with force: see /qa/ for the purest example of this line of thinking in action. To them, memes are serious business, and they're the people you see marching on the streets wearing cringey Kekistan flags.
OR they're entrenched robots of the type that drove out all intelligent discussion from their home board who complain about the same issues in their life every single week and refuse to better their situation no matter how many times you try and give them advice, making it clear they're only doing it for attention. They're here and everywhere else but /r9k/ because the bot prevents them from reposting on their homeboard, and the only place you won't find them is /adv/.
Both types of poster are irritating and they erode the culture of whatever board they settle themselves in to replace it with more /pol//r9k/ garbage bereft of originality. It's the definition of cancer.