

So IIUC, you’re saying it’s for a phone to configure the appliance? The reason being that the appliance’s UI is not convenient enough, I presume?
In the case at hand, the Karcher DAB radio has no iOS or AOS app. So AFAICT it would only be feasible if the radio also had a built-in web server and a captive portal. But I get no captive portal when connecting.
I suppose another theory is that if the radio has a cloud uplink, perhaps it would then push a captive portal to redirect to a centralised server which then remotely configures the device. I would not trust it enough to give it an uplink so I can’t test this theory.

Any SSID broadcast is useful to Google and Apple spies (read: simple phone patrons) who feed the SSID to the mothership which is then used for mapping. There are security risks by that alone even if it’s blocked from my LAN, which I detail in these threads:
Apart from tracking my residency, I boycott both Google and Apple, so I object to feeding them in the slightest even when it’s innocuous to me. The map data enhances their location products and feeds their advertising surviellance machines.
Anyway, I appreciate your insight. I assumed it was a proactive act by Karcher and would not have thought that they were naive or lazy w.r.t. something baked-in upstream from them.