I can find an option to opt in and setup the service but not one to opt out. I opted out in the past but it seems to have turned on again.
So far this fails with SH2 ? Err yes, new contract/account pushes you onto EE (but no info at all on disabling BT/EE Wifi). I did follow the suggestion (url link) in community forum recommendations, but can still see the (hidden) WiFi is present. And yet I'd happily put back the Netgear router, but you need SH2 for the landline phone. Alas no choice when renewing your contract.
I think "Public WIFI Status: Activated" within your Hub is just a visual bug. I opted out of this "feature" from my account page, then went to my Hub set up page, to "Wireless" section, clicked on "Change Settings", and on the right hand side there is a slider to "Disable All Wireless" (I assume rarely anyone here uses Hub's wireless, and use their own router for wifi). Note that "Public WIFI Status" is still shown as activated on my Hub. Then from my phone I checked available wi fi networks with wifi analyser, which showed me that any BT/EE wi fi networks are not within my house, so it is relatively safe to assume that this **bleep** is disabled.