Yes it is news worthy for the same reasons facebooks role in the election was news worthy, the same reason Goldman Sachs behavior was news worthy in the 2008 great recession.
People hold these companies and their employees in such high esteem (to the point some people don’t thing articles should be published about their bad behavior, rather articles should be published about other firms hypothetically engaging in the same behavior if the companies in question didn’t).
At the end of the day the worlds biggest companies are willing to knowingly take money from foreign governments to illegally spread propaganda to influence elections, help firms sell drugs that literally end up killing people, and sell their own investment clients toxic assets while offloading their own position on the same assets.
You are right others may have engaged in the same behavior, but: 1. That’s not news worthy and 2. other firms likely would have actually suffered real consequences. Certain firms like Facebook and others continually receive bad press because they continually engage in bad behavior but keep on like it’s business as usual. In other words, the article is focused on McKinsey not because there is a grand conspiracy against McKinsey, but because McKinsey actually committed the bad acts the articles is about.