Well for starters you're stealing someone else's network connection. Which makes any diagnostics useless.
"stealing"? The WiFi is configured as "unsecured". Isn't that the same as stringing a bunch of 10baseT cables randomly out beyond your property line? Would someone attaching to those 10baseT cables be "stealing"?
No doubt "stealing" is not involved if the WiFi is "secured", even if that security is the simplest.
The difference is that one indicates "no tresspassing" (secured) and the other does not.