A friend of mine who lives in New York actually has an apartment where all building an unit access uses an RFID enabled lock system with an app on the phone. It’s very easy for the owner to lock someone out and the system went out twice and they couldn’t get in. She doesn’t even get a physical key for a back up.
Read the lease carefully. Two years ago some tenants in NYC won a lawsuit against their landlord for not giving them keys.[1]
Anyway, I assume Amazon is already considering what GP proposed. They have a program called Alexa for Residential[2] marketed to property managers who want to put IoT things in apartments.
Sinister? I’m not sure I understand. The doorbell doesn’t stop one from entering their home when Amazon servers are down. It also doesn’t stop people from knocking on the door.
You're missing the Forrest for the tree. What about smart door locks, smart boilers, smart heaters, smart AC thermostats. smart bathrooms, smart fire alarms..?
If the doorbell stops accidentally when Amazon goes down, it can also stop intentionally at Amazon's discretion.