Reading that I couldn't help but think there's parallels to HN. At least HN tries to be transparent about "the algorithm", and it's essentially a dumb algorithm compared to what X/FB/etc use.
If people don't already know, the internet is easily manipulated and people tend to get ideas and reassurances of ideas based on what their group's opinions are, and those opinions are manipulated. It's easy to create multiple accounts, easy to change IP addresses, easy to bot comments; anyone can do it and it's easy to automate.
The earliest example I can recall was manipulating the Amazon ratings system, now it's everywhere.
They won't because it would reveal moderation biases and trends.