Advertisement is fine on its own, as long as we live in a goods/exchange/services world, you will need to display your wares somehow so people will buy or trade for them.

The problem is lack of limits or regulation on how far a company can go with that advertising. We're so, so far beyond intrusive commercials or annoying jingles that it's lethally depressing. We have companies who know and understand how to change your feelings, to implant ideas in your mind, to rob you of your free will.

And even if you're someone who says "I block every ad and don't buy from that company" like most people commenting in this post, advertisers already have accounted for you. They're playing the numbers game and they don't give a shit how much you scream you hate their slop and propaganda or how many ad-blockers you install, they aren't targeting you directly, they're going for the percentage of people who do stare at the screen or people who are more mentally compromised first. If they can get enough of the vulnerable class to build momentum, they have gone from a product to a movement and then even the cynical people like those in this post will start to see Product X more like a normal staple than an annoying intrusion in their lives.

See: the Trump effect.