Subway national ads & coupons (among other practices) in particular are notorious for immiserating or ruining their own franchisees. My nearest one keeps a sheet with the list of the ones they'll actually honor.

I wanna say Little Caesars had kind of a similar situation. I think they actually had a fight at one point with their franchisees over their too-static-to-be-realistic very-low prices.

In practice, these national campaigns seem to kinda be a bad thing, anyway—either abusing franchisees who can't evade them, or else not actually being offered universally (which is pretty damn close to false advertising, "participating locations" fine-print being more a bullshit dodge than something intended to truly communicate the truth of the offer).