One of the dirtiest tricks that Uber uses -And I found this out through firsthand experience - Is doing performance reviews where all feedback is public (I think technically it's only shown to your manager and team lead, except they're expected to make it public). This prevents you from writing negative feedback, and even damning with faint praise is a sure strategy to face retaliation. Rather than work out, privately, when one of your coworkers is underperforming, you only have the option of naming and shaming.

I'd really like a culture where this was viable - I'd love for nearly everything to be done in the public sphere, and even 'backstabbing' to be handled in the clear, but since Diffie–Hellman exists, it's not viable.