Reminds me of what my last isp did to me with email, to an extent.  Every account got 5 email addresses.  The default was the bill payer's first initial, last name.  I had one of the secondary email addresses of my first initial, last name too.  One day, someone with the same first initial and last name as me signed up, and they assigned him my address and removed my access.  That was really frustrating since I had that as my primary email account at the time.