"Everyone buys up": why to Public joint-stock company "Sberbank Russia" and to LLC "YANDEKS" tens of companies?

The large technological companies, such as LLC "YANDEKS", Public joint-stock company "Sberbank Russia", Mail.ru Group, actively buy up small, and sometimes even medium-sized companies. And, not only in the branches, but often even not in adjacent, and in businesses absolutely far from their basic. Experts call it a new trend and consider it positive for both parties and for the markets where technological giants considerably accelerate digitalization processes...