It's not about only online ads. It is about any ads.

There is a very simple principle - if something heavily advertised, that means money, that could have been spent on better components was thrown into ads. Things with lot of ads will always have lower quality than same things for same price but without ads.

Advertising is an integral part of modern shit-oriented economy. It is used to program recipient that a product is not a shit, but something necessary and useful. To replace actual properties of a product with virtual, imaginary ones in the brain of recipient, with the ultimate goal to completely divert a potential buyer from any questions about product itself.

Modern economy does not even sell products, it sells imaginary feeling of how good you will feel and look in own eyes and eyes of others while owning advertised product. And it absolutely does not matter what product really is.

However, modern online marketplaces throw a brick into that advertising house made of glass. More and more people began to read customer reviews and comments for the item before purchaising and gladly share their opinions with others. Shit-oriented economy strikes back, spending advertising money on false reviews and comments on marketplaces, but it is easily detected. And no, so called AI™ is unable to properly mimic as real people in that area.