It’s worse, they threaten to fire employees who speak out against the company’s business practices in any way:
In the statement, the employee group claimed that Amazon changed its policy in September and that the updated policy “requires employees to seek prior approval to speak about Amazon in any public forum while identified as an employee.”
the linked article doesn’t have a great summary of the actual study (the reality of the document is much less dramatic and really more interesting) and the link in the document is busted so i recommend you at least skim the actual army war college study for context but