There are also ads for services. I used to be a photographer, and without my little Facebook/Instagram ads people would have had to largely rely on word of mouth, meaning the more established photographers would absolutely dominate my little rural market even when their photography was worse.
Also, I'm not sure we want a world where only the largest corporations get to sell things. That's what would happen if people could only find things through stores and catalogs, especially pre-internet.
If I need a photographer, I'm going to go and search for one. If no one is allowed to advertise to me, then both the small and large players in the space are on an even playing field. Your photography website or Facebook page will be just as searchable or indexable as before, as will business directory sites that can help people find services they need, along with reviews and testimonials.
Banning advertising could actually make it easier for new entrants.
Back then you'd have physical bulletin boards where you could either freely pin your handwritten note/"ad" onto or you'd have someone do it for you. Still technically an ad though.
It's the big players who have the most money for ads, buy up all billboards, internet and TV ads, etc. A small shop can't afford to do that. If ads were completely banned (in all forms including the bulletin boards) then everyone would have to rely on the word of mouth not just small businesses.
I also think that fields like photography are just highly competitive regardless of ads so it's then mostly a networking game.
Capitalism always hides behind the petty business owner/store owner/craftsman. Then the haute bourgeoisie takes the bulk of the profits.
If I go looking for a directory of [service, in my area] that’s hardly an ad! If those include, say, reviews and pricing info, great! Yes, please!
I definitely don’t want that directory to be skewed with ads in favor of those with the most money, or who have decided to burn the most of their limited resources on ads instead of improving their services, lowering their prices, or hell, just taking more profit. The ads were the biggest problem with the good ol’ yellow pages.