Because the anarchist symbol is on more merchandise and is represented more in capitalist media as something "cool" and "punk."
Anarchism is very much marketed as an ideology to be consumed to divert the working class from approaching theorists that revolutionary movements have leaned on to actually overthrow capitalist regimes. This isn't to say that there aren't valuable anarchist insights, just that objectively anarchist movements have yet to lead a successful revolution that can sustain itself.