Thinking in terms of “need” is wrong for a business. They aren’t there to make a good product and the money is just to cover all the costs. Their goal is profit maximization. If there’s profit they could be extracting, but aren’t, they won’t make the numbers bigger and the shareholders will be sad.

Ads are a gas. They expand to fill all available space. If there’s a place an ad COULD go, then it WILL go there eventually.