Because normies are culture vultures and will always eventually gravitate the the absolute fringes of society in order to be "cool, quirky and different".
I even tried to stop using the term "normie" because I've literally seen NPCs in public referring to other NPCs as normies.
Also inceldom is only becoming more of a thing, it's not going anywhere. Women standards have been going up, not down, which alienates more and more men who seek refuge on the internet and eventually find the blackpill. Couple that with the general existential crises that people are dealing with these days.
Unfortunately it won't be long before, like the redpill, we see blackpill grifting faggots making money off making blackpill content. Wheat Waffles already does it (cuz he's a redpill looksmaxxer in disguise), and there's even a bonafide chad making "blackpill" content now who already has quite a following.
These communities will become diluted and we will have to resort to the next extremity to keep the normies away and the glowies will keep glowing. The overton window is opening. Endless cycle.