You've hit the nail on the head. Whenever this type of practice is used to fight against the extreme right (in theory), it inevitably ends up being employed far

You've hit the nail on the head. Whenever this type of practice is used to fight against the extreme right (in theory), it inevitably ends up being employed far more often against the left, and not just the "extreme" left. Environmentalists, civil rights activists, anti-racists, economic leftists, and others get caught up in these nets while somehow the stated targets on the right tend to get a slap on the wrist. The organized left has always been more of a threat to the establishment than the far right. Nominally leftist activists who push this sort of tactic would do well to realize this and resist the urge to encourage and allow this behavior from corporations, and especially corporations as powerful as Mastercard.