It’s a critical element of the financialization of the economy that has lead to it becoming even more irrational and unstable than it was before. Easy example, look up stock buybacks. It’s not just that though, it’s the entire system of obligation to shareholders to deliver quarterly gains with no concern for employees or even the long-term health of the company.
In most lemmy instances, the default feed is a mix of that instance’s and popular threads from other instances. Participating in such a thread that you find spontaneously is therefore not anything resembling “brigading,” even if other people on your instance also see it spontaneously and participate.