Wonder how long it’s going to be before we see something like a home Wireless modem which has 2 SSIDs. One for your standard internet access and one that is designed for IoT. Put firewalling on it so it can’t smash the internet. Have special rules auto-applied to each device depending on how it identifies itself. Including rules that say “If trying to talk to net and exceed cut off device from internet”.
Obviously, it’d be better if IoT had proper security in first place. But this is turning into the Wild West again.