Some people have posted a list of the SSIDs around them. What’s the chance some of those dozens also having one of the others nearby? Pretty low I’d say.

There’s also the fact that you can use previously posted information by a user to narrow down the list. Let’s say an SSID is found 50 times, one in each US state, but the user posted in another thread what state they are in? You just narrowed down the list to a single SSID.

Being safe online is a bunch of things together. You just need to piss of the wrong one to have it all combed trough. Posting the name of an SSID close to you is like posting your street name without the city or country name.