I see what you are saying. I had forgotten that the guest network is set, by default, to not need a password. I have my guest access turned off completely, but I now see what you mean.
That the auto can scan for a network and connect automatically to one it finds without first requiring the owner to approve the access to that particular WiFi is a bit ridiculous and could be a pretty bad idea on the auto makers part.
Ryzen 5 3400G | MSI B450M Pro-M2 MAX | 16GB Corsair Vengeance DDR4 3000 | XPG SX8200 Pro 512GB NVMe | Windows 10 Pro