Many of those corps also have restrictions on speaking/posting publicly as well, and something like setting up a blog or Youtube channel would need legal approval. Some even ban public posting on social media and forums. These restrictions are not just on confidential content as well, but on literally anything you post publicly (as it may affect how others view the company). Due to IP agreements anything you post is also considered corporate IP anyways and thus even commenting on social media is forbidden.
Therefore if you see say a Github user who hides behind their screen name, or a HN commenter who purposesly keeps their job details vague, that could be someone who doesn't want to be dark matter - but the company policies force them to hide that way.
Therefore if you see say a Github user who hides behind their screen name, or a HN commenter who purposesly keeps their job details vague, that could be someone who doesn't want to be dark matter - but the company policies force them to hide that way.