That's a ridiculous strawman to build, not donating via a corporation to a corporation (which the big non profits that these campaigns tend to raise funds for operate like) absolutely doesn't equal not donating anywhere else, if anything, people who are that aware of what a scam corporate charity is are significantly more likely to be donating and volunteering locally and directly, You're also leaving out that these corporations aren't just faceless and heartless, but are active contributors to maintaining the status quo and the systems that create the conditions where these charities are needed in the first place. Making any excuse for them being a middleman - for their benefit because if it wasn't they wouldn't do it, is completely missing the big picture.