So that would exclude:
- listing your house, or car in the classifieds
- buying a sign for your business (ad discussed in other posts)
- buying a garage sale sign
- buying a for sale sign, or flyers for your house for sale
- paying a realtor to sell your house
- paying a reporter or professional reviewer to write a review. Even if they are paid by a newspaper/magazine/consumer report site, money exchanged hands for something that promotes a product.
- distributing a catalog
- paying a cloud provider or VPS provider or website hosting service to host a website that promotes your product
Also, what exactly constitutes a "product"? Does a service count? If not, that is a pretty big loophole. What about a job position? Or someone looking for employment?
And finally, advertisement in some form is kind of important for making customers aware your product exists. Word of mouth isn't very effective if you don't have any customers to begin with. I would expect removing all advertising to have a chilling effect on innovation and new businesses.
To be clear, I think the current advertising environment is terrible, and unhealthy, and needs to be fixed. But I think that removing all advertisement would have some negative ramifications, especially if the definition of an ad is too simplistic.