If you want to sell detergent or coca cola, you can advertise to everyone, because anyone can buy your product. If you want to advertise a new invention of a small light that catches mosquitos (which I recently bought from an IG ad), your market is pretty small and Facebook's targeting was actually pretty awesome at helping you build a business.
I'm not saying that collecting all this data is ok, but it is rather annoying that yet again, regulation just basically fucks with small businesses (and facebook), and in return we will again, only see toothpaste and detergent and perfume and german car ads everywhere.