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If you are doing it yourself, it costs you time.

If you want someone else to do it, it costs you money.

what's the point of that pedantry?

Managing ad campaign takes time too.

"Something else also costs you" isn't a rebuttal to the statement that it isn't free.

I don’t think you’d find anyone saying an ad campaign is free. A grandparent comment is saying a coldcall/email campaign is free.