They also receive a large number of baseless complaints (IE are about re-litigating the case. For example, in a divorce, they often receive complaints about lawyers because the client lost, not because the lawyer did anything wrong. )
As such, they spend most of their time and energy mostly investigating egregious issues (IE stealing from clients, etc). They also get referrals from judges about bad or illegal behavior.
It is unlikely a complaint about DMCA behavior is going to go anywhere.
It is guaranteed that the lack of a complaint will not go anywhere. And legal processes tend to be VERY slow and inefficient but they thrive on formal documentation.
What you write is a truism, but i'm not sure it's that helpful. The post i responded to seemed to be trying to understand the tradeoff and likelihood it has an effect, which is what i was answering. You have not argued it will have an effect, actually, just said it's non-zero probability.
If it cost zero time/energy to file a complaint, sure, why not. That isn't the case here and most people want to understand the tradeoff, not the extreme.
Otherwise, you'd just do everything, regardless of time/cost/effectiveness.
Right now it's just one message on LinkedIn. If I hear form them again ... I'll have to think about it / contact a lawyer.