This is very concerning, reminds me of Amazon Sidewalk.
All I can think of is "Smart TVs" and the care you need to take to keep them from going online to exfiltrate your data. They won't ever need your Wifi credentials if they can just piggy back on this.
My point is device manufacturers will just add Thread radios in their shitty spy devices and they will gain network access via Apple connected devices whether we like it or not.
That's what Amazon Sidewalk was designed to do. Your Alexa devices that already have network access would just gracefully allow other sidewalk devices network access too.
All I can think of is "Smart TVs" and the care you need to take to keep them from going online to exfiltrate your data. They won't ever need your Wifi credentials if they can just piggy back on this.