Pure laziness.![]()
Maybe also a little privacy/anonymity. Although actually, I have used the same handle/screen name or versions of it on different forums, platforms, websites, etc, since the late '90's. I know I'm not the only person on the internet with a screen name that contains "coluber" but it isn't so common that a determined person couldn't use it to find out plenty about me.
But now that I think of it, maybe I'll fill in the profile a bit.