I know I wouldn't.
I already have a keypad deadbolt. Not smartphone enabled, etc.
If I want anyone to have access, I'll give them a specific code.
Like my granddaughter, or my kids.
Going through Amazon? With a specific IoT keypad/deadbolt from them?
"all while being monitored with the company's new Amazon Cloud Cam."
Not a chance.
There is no possibility of them vetting every single delivery person. Before long, someone will get robbed (or worse) behind this concept.