I am not sure why you are getting downvoted as this is an astute analysis of the situation. I had the same thought: if the person you are relying to is helping promote say a cigarette company advertising to tweens and the brigading group is mothers against child smoking then I would be inclined to support what that group is doing to stop the marketing campaign. Similarly if the advertiser is trying to advertise something like The Big Lie which is actively harmful to the US democracy, and well, a lie, then I would also want to support the group trying to report the campaign.

This doesn’t cast a value judgement on whether any of this is good or bad, just that you’ll never get an objective measure of the situation based on just what the person you are replying to have us.