What if...
With my PC being fully 3' from the router I use an Ethernet connection and my wifi capability remains "off", or it would if "off" was an allowable state; actually I have it set to be functional for as short a time as possible during the wee small hours.
However I know from those occasions when I use the laptop at home (also "wired") that it can see usable signals from neighbour's wifi equipment.
I wonder what fun will arise if I accidently* bring IoT enabled items into Maison Commswonk and it affiliates with someone else's wifi and sends back all sort of data about "me" when in fact it will appear to be sending back all sorts of data about "them".
* I certainly won't do it by choice.