I doubt the businesses would care. They may be getting nothing but noise but they'd still package it as good data and sell it on to their customers who I seriously doubt would know any better. If the ultimate punters, advertisers, are happy to push stuff that you've just bought and aren't likely to buy again then they're not going to be put off by data pointing to something else - it might even be more useful to them!
Just keep blocking the ads. That's what makes data, real or fake, worthless.