Security researcher and gentleman Mikko Hyppönen tweeted this in 2016:

Hypponen’s law: Whenever an appliance is described as being “smart”, it’s vulnerable.

My favourite response was from @naranek:

It’s probably time to start calling “dumb” appliances “safe” instead. Would you want a smart fridge or a safe fridge?

It also reminds me of Geroge Neville-Neil’s comment at AsiaBSDCon 2018:

The S in IoT stands for security