Amazon has their own delivery service, bought wholefoods, and now bought blink. Blink has a doorbell offering plus the camera's that you already know of. It's not a stretch to have groceries delivered all the way to your fridge and put blink cameras all over the house to make sure the delivery guy walks back out when he's done.
Amazon is definitely pushing the boundaries of what amount of privacy people are willing to exchange for convenience. I was shocked that so many people I knew bought Echos... wiring your entire house for video doesn't seem that much crazier.
It's more that it hasn't been as affordable to the masses.
The occasional package being nicked isn't sufficient for me to give my home a James Bond/MI6 style upgrade.
Unless you're living in the wrong part of the world, you're paying for anxiety medication, not security (a package in the open but monitored by camera can still be nicked, so it's not secure).
Personally, I prefer a bong rip and shot of scotch for anxiety.