How Effective are Behavioral Factors in Google?

Google has been using behavioral factors for at least several years. However, they most likely worked even before that, they were just never on anyone's mind, and nobody attempted to investigate them or even manipulate them. Not so long ago it became known that Google had patented a method of monitoring behavioral factors. There wasn’t much new information there, but the company has stated many times before that it does not monitor behavioral factors, that this is too noisy a factor and that they are too easy to manipulate. As It turned out,  they are being monitored after all. However, it is very difficult to manipulate them in Google. Why? 

So, manipulating behavioral factors has never really worked for the following reasons:

1. It has always been necessary that the user who's performing manipulations had a prior history (recorded site visits and search history for indicating some kind of activity on the relevant topic, etc.). As a result, the whole procedure turns out to be quite expensive. 

2. Rapid ranking increase has never been the case with Google. This means that moving the desired page to the top results exclusively via behavioral patterns is possible if it's somewhere on the 2nd page or at the bottom of the 1st. However, this method alone wouldn't be enough to move the page up from much lower positions. 

When it comes to monitoring, then the impact can be traced simply by changing the snippet. For example, your site struggles to rise higher than its current 7nd position. And often, if you change the snippet, making it more attractive, with a lot of additional blocks (rating stars, for example), with emojis, etc. — then only this can move the site’s position from the 7th to, for example, the 2nd without changing anything else. It is quite difficult to connect this with something else. And it has been like this for a while. 

In conclusion, behavioral factors do work in Google, but manipulating them is not an easy task.