Do you not recognize how this scenario can work to preserve monopolies?
How does Apple come back from the brink of bankruptcy without their iconic iMac and iPod marketing campaigns?
And how do you flip the switch to making advertising illegal when incumbent companies have already enjoyed the benefit of legal advertising for hundreds of years? We ban advertising, and I start my new soft drink company, but Coca-Cola got to advertise for 100+ years already. The cat has been out of the bag for thousands of years.
[1] https://www.overclock.net/threads/teacher-calls-linux-%E2%80...