BBSes usually required your name, home address, and phone number as part of signing up for an account. I never gave it much thought when entering my information nor later when collecting it from others when I was a SysOp. Once in a while when driving around I might see a street sign and think "Oh, that's where Frisbee_Guy lives" if I recognized it but never considered using it for anything nefarious. Also remember computer magazines of the time often had sections where people would get their problems published along with an address for anyone wanting to contact them about it. Sometimes even a phone number.