3 ms·i wonder if that is to stop people from using names like comcastSucks or worse.by hidroto 11y agoi wonder if that is to stop people from using names like comcastSucks or worse.rdancer 11y agoIt may not have been the rationale, but it sure must be the most common use-case.akurtzhs 11y agoIt also avoids security problems with fraudsters creating official looking emails - "comcastsupport" and the like.