It also sounds like they're promoting yet another way to make "the internet" slower, more bloated, and have greater impediments to usage.
They lost me more than a decade ago when they hoovered clear text passwords from their wifi scanning and blamed it on a single engineer.
I don't see how advertising an open WiFi network is much different from advertising an open house. In both cases you should expect visitors.
You can take advantage of it, but almost everyone is going to feel like it's not right unless they have consent.
An open house would be akin to have an open wifi network labeled "PleaseUseMe".
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".