It's not (only) about that. These techniques are often used to help advertisers combat click fraud, so it's important to distinguish the users that just disable

It's not (only) about that. These techniques are often used to help advertisers combat click fraud, so it's important to distinguish the users that just disable cookies (because they heard they are harmful) and those that are trying to skew the click-through rates. A few years ago Google boasted that they catch 99.97 % of click fraud on time, and I personally believe them. Note that I am not trying to justify these techniques.