Dirty methods of competition between Burger King and McDonald’s

The war of brands between McDonald’s and Burger King has been going on for quite a long time and has generated many excellent and exciting advertising moves. In any war, there is a side that acts as an aggressor. In this war, the aggressor is – Burger King. McDonald’s follows its principles and builds relationships not with competitors but with consumers, although sometimes it strikes back.
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This time, Burger King made an attack on McDonald’s with the hands of their clients. They offered a 50% discount to everyone who enters a query in the search string Yandex with a negative to McDonald’s. After such a request, the burger encouraged its consumer with words, “And you are good!”, And transferred the promotional code to a discount.
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Yandex quickly blocked advertising, and the dirty share ceased to exist. The war of brands often evokes delight and interest, but this event leaves a lot of questions. And how do you feel about this brand behavior?