Was there a ban wave on gathering bots?

I have noticed that in the last two weeks herb and oily blackmouth supply in the Whitemane alliance AH have dropped dramatically. As a result the prices have been steadily climbing. I wonder if the sudden drop in supply for Gromsblood, Ghost Mushroom, and oily blackmouth (to name a few) is a result of a recent ban wave on the bots that gathered these before?

Nah, more like the mafia controlling the prices