If you are advertising that your door is unlocked, and the precedent is to enter unlocked doors - as it is to connect to open networks, then yes. Permission in such a scenario is implied.
You make these analogies attempting to equate an advertised open WiFi network to an unlocked home, while ignoring the precedent around both of those things.
It is expected that people connect to your advertised open WiFi network. It is not expected that people wiggle your doorknob to check if it's unlocked or not. If you put a sign on the door advertising, "the door is unlocked!" then I wouldn't be surprised when someone mistakes that for "come in".
I think that depends a bit on context. If I am at home, and my neighbors are advertising an open Wi-Fi network, I’ve never taken that as an invitation to connect and use it. However, if I’m at coffee shop Foo and I see “Foo Guest” advertised, then sure…
No it doesn't. Imo, that would be both poor etiquette, and a violation of trust.
While I do remember hearing about Google Maps vehicles connecting to open WiFi networks in the news, I don't recall hearing about private credentials being published. Was that the case? I thought it was just a map of open WiFi networks that was published with basic details such as SSID?
Edit: I found the article (2010, holy cow does time fly). It looks like they did collect payload data for non-encrypted traffic. Even though the data wasn't published in any way, I must agree that they went too far. I would have no issue if they were to simply verify that they could connect and record basic info such as SSID, but collecting payload data from network requests was inappropriate.
You make these analogies attempting to equate an advertised open WiFi network to an unlocked home, while ignoring the precedent around both of those things.
It is expected that people connect to your advertised open WiFi network. It is not expected that people wiggle your doorknob to check if it's unlocked or not. If you put a sign on the door advertising, "the door is unlocked!" then I wouldn't be surprised when someone mistakes that for "come in".