What action would actually fulfil this criteria for people's opinions to matter?
Changing what is happening requires active engagement. You have to seek out the places they take input - e-mail, support channels, their social media feeds, etc - and put your message there.
But, even then, what we are talking about is a statistical thing - when many folks collectively have basically the same message, that may see movement. Our opinions only matter if they collect into a business-impacting whole.
They're not going to just randomly pick up public posts even to their own social media.
From things that have been said, I take it that they do have folks watching their social media, and taking impressions from that.
As an example of what kid of action I am talking about, when they took the credits for the Digital Design Team off of products I have bought the digital versions of, I put in a support request for each of those pages, saying the content was missing, and they should put it back.
I then came back here, and noted to others that this was possible. At least 30 people reacted to that, so I can hope some of them actually took the action.
And I suspect nailing your terms to the front doors of their corporate campus ala Martin Luther would only result in security politely asking you to leave.
Sure.
But, posting here is like a bunch of revolutionaries sitting in a café, sipping Turkish coffee and complaining about the state of the world. The likelihood that an official just happens to be in the same café getting a croissant, hear them, and be moved to change the world? Not high.