I work in tech, so I can probably give you some insight. The security structure of tech companies is meant to protect trade secrets, their technology, or the layout of their office to prevent people from engineering an attack. Of course, some floors have a lower security level than others, I believe that would be case with Anna and her "YouTube" rendezvous.This made me look back at the video, the beginning kind of looks like he’s signaling something with his hand? Maybe he has an ear peace that he’s touching?? Calling his superiors telling them it smelled like sewer rat. Then in the second post he’s walking and looking at her. I tried my best to capture the hand movements.
In some buildings, the lobby receptionist will demand you to cover all the cameras on your phone with a security sticker, you can take these off once you exit the building.
Anna thinks it's quite harmless to overdo main entrance pictures, but in reality, security is assessing whether she's a threat or not. Her strange behavior is definitely a red flag.
Hi Google, don't let this woman in there again. She was just filming inside the opera, who knows what she's capable of.