What protection against cheating in Yandex Direct?

Question

contextual advertising

Good night =)
Tell me what kind of protection is used against the "cheating" of an advertisement placed on Yandex Direct and Google Adwords? Where is the guarantee that clicks from your advertising campaign cannot be "cheated" by robots? This, after all, could be effectively used by competitors in order to write off funds for transitions that were carried out not by a potential client, but by a script through "left" proxies. This would certainly be used in advertising campaigns with a narrow specialization or in expensive high-frequency queries (just one click and -50 rubles from a competitor).
Since the thought is on the surface, I think that some kind of simple solution is used, but nothing comes to mind, since filtering by IP is bypassed using proxy servers, and you can not receive cookies or clear them whenever you want.

Answer 1

None, only those that logic tells. There is no guarantee that this is a human and not a robot. Well, maybe the captcha helps. And so .. everything is emulated.
One boss in the morning asks the whole department to call competitors ... this is a tradition and a fact)

Answer 2

Well, Yandex and Google have their own antifraud, and they periodically remove left clicks from their systems. Mechanics - do not disclose.
On the other hand, if there is a feeling of a click, you can contact Yandex, and they will dig a little more carefully with your traffic - perhaps they will write off something.
There are systems like clickfrog / botscanner that monitor the traffic itself, you can also ask questions based on them

Answer 3

for protection, they mainly use logic, how a bot does it and how a person does it in different sequences (there are so many differences that one can list endlessly), and of course statistics, where they check what people do and how they react to it and at what speed.
And as they wrote above, if you are afraid that you are clicked, then contact Yasha and Google immediately