How do you expect small businesses to acquire customers? Spending tens of millions of dollars competing in generalized ad space to reach the same audience they can reach today with $1000?
Most small businesses that exist today would become nonviable overnight, and that is a huge chunk of the economy. Sure, you can say "they shouldn't have the right to exist" because they use targeted ads, but I have yet to hear a solid argument for why such ads are an infringement on our fundamental rights such that the whole SMB segment of the economy is worth destroying.