I imagine it's mentioned elsewhere in this commentary, but the key point I think this chap missed was not connecting to a wifi network under his control.
"A browser hitting that returned a page to connect the lamp to local WiFi. That is a no-go ..."
You can buy prosumer routers nowadays for $99 USD which enable one to setup different subnets and VLANS such that a device is accessible on the network but unable to access the internet.
I'm not afraid of IoT like some other tinfoil types commenting here - just make sure they can't call home (I'm looking at you Samsung TV)
"A browser hitting that returned a page to connect the lamp to local WiFi. That is a no-go ..."
You can buy prosumer routers nowadays for $99 USD which enable one to setup different subnets and VLANS such that a device is accessible on the network but unable to access the internet.
I'm not afraid of IoT like some other tinfoil types commenting here - just make sure they can't call home (I'm looking at you Samsung TV)