Discounts on context in Yandex and Runner

It turns out that contextual advertising services are really fighting dumping.
Today I received a letter:

The company “Runner” deprives of accreditation and stops working with the advertising agency “Aera”, Moscow, in connection with the latest violation of the Dealer Agreement.
We remind you that according to clause 3.1 of Appendix 1 of the Dealer Agreement, the Dealer has no right to provide its customers with discounts on transitions and shows in the “Runner” system.
Providing discounts to its customers leads to increased unhealthy competition between dealers, which reduces prices on the market and deprives the profits of both Dealers and Begun company.

Yandex also removed them from the list of accredited agencies, but did not disseminate official statements.