There are a lot of methods allowed in advertising that are basically fraud, and a lot of methods to deliver advertising that are basically stalking. That doesn't mean that people shouldn't be allowed to post what they have for sale.
Well the thing is the amount of resources spent on advertisement is usually inversely proportional to the amount of resources spent on "goods and services i may desire or need".
I'm not saying it should be illegal to post about what you do. But advertisement is paying people to relay your message they couldn't care less about. It's not the same as people recommending products/services, although the frontier has become blurrier now with all those "sponsored" articles/videos.
The simple act of making a spectacle of their products announcements are advertisements. Not clickable ads in a website but an ad regardless. They could quietly release products every year by updating their website but that wouldn't sell nearly as much...