Yandex bought Google or one of the two

If I understand something, then a hole is a hole, and a hole is a rabbit, and a rabbit is a good company, and a good company is a company where they can be treated to something!
What am I talking about? But about what!

I accidentally discovered a strange relationship when analyzing incoming traffic to my site. Its ads revolve on AdSense for the keywords “free ads,” “ads,” “ads,” and other less significant words. So, the end of the advertising campaign was approaching and I decided to see how much the traffic would decrease if the advertisement was temporarily turned off.
And what do I see? Guess three times ... No one guessed? Traffic is over. Well, not quite over, a dozen clicks a day were, but only a dozen. The li.ru counter which is installed on each page has fixed it. Having opened the statistical data and analyzed them, I was confused.

If during the advertising campaign, half of the traffic was from Google and half from I ndeksa, which is quite natural, then after its suspension, Yandex also shut up at the same time as Google.

Turn on AdWords and everything returns to its original state.
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The people again went in equal parts from both Google and Yandex ! (It was April 7.) And here comes the question.

How to explain such unscientific correlation in the behavior of the two search engines?
Or I do not understand or one of the two.