People around here only understand car analogy's so here goes:
This is like encouraging others to drive by leaving your car unlocked and with the keys in the ignition and a sign saying "please drive me, but be safe and courteous, and let me have a turn once in awhile", all the while hoping people won't speed in your car and of course won't do hit-and-runs, bank robbery's, and other mischievous things from your car. Of course, the only difference here is your car would actually get stolen in the process, your internet will just be borrowed and misused.