I've wrote about this before but basically it's likely due to the fact that anarchism is the first flavor of radical politics most westerners and especially Americans dip their toes into. It's no secret that feds have deliberately fanned the sectarian flames and made attempts to coopt anarchism. After all it's too appealing to the American myth of the self sufficient frontiersmen and homesteaders to extinguish its allure entirely.

This means you have a hugely disproportionate number of self-identified anarchists who are really just baby leftists who haven't been exposed to any form of praxis beyond mutual aid and fucking with cops and have gotten most of their theory filtered through breadtube, which can be good if they land in the realm of say Luna and NonCompete, but principled anti-imperialists are certainly the minority.

That's not to say other tendencies don't have their own weirdos with bad takes like the PatSocs for example, but they aren't as prevalent because there isn't nearly as big an audience as there is for radlib grifters riding the (however small) new wave of leftist politics emerging in the west.