1. They're paying a lot in rent.
2. if they don't have workers in the office, then, adjacent spaces for ex. food service is less valuable.
3. If adjacent space is less valuable, the landlord is motivated to raise Amazon's rent to compensate
4. Therefore, they're making people go back to work to avoid rent increases
4 years on, and it seems a little bit odd it took that long for it to play it. But it seems (much) cheaper and sensible to find somewhere else to rent than give in to a threatening landlord who sees you as responsible for any shortfalls in adjacent revenue, instead of the anchor tenent you are.