Not using encryption to hide your public service is perfectly acceptable. If you come to my house, you can access my wifi network. No password needed. It's my gift to you.

This information is not public. It is a set of shared secrets. And now it has been shared to everyone in the world, rather than those who the owners wanted it to be shared with.

This isn't public info in some cases though. Airline sky clubs charge a fee and one of the benefits is their wifi (note that on the map, these aren't just airports, but airline sky clubs).

That's like you coming to my house, I give you the password to the wifi, and then you go tell all the neighbors about it so they can get "free wifi".

What's the red herring here?