It might be perfectly fine, but why should the target of this campaign- also a private entity- refrain from denouncing this and retaliating with bad publicity for the involved advocacy group? Twitter/ X lives off ad revenue, and the ADL lives off its reputation of a non-partisan organisation pursuing a laudable cause. If ADL can erode X's advertising revenue, I don't see why X shouldn't fight back by trying to weaken the ADL's reputation, as long as it is done in the open and by legal means.