This is the placeholder text everyone sees in the edit tab of a profile if the "about me" section is empty (emphasis mine):
BY DAY: Alt-Rock Ninja Cowgirl at Veridian Dynamics.
BY NIGHT: I write code and code rights for penalcoders.org, an awesome non-profit that will totally take your money at that link. My kids are cuter than yours.
FOR FUN: C+ Jokes, Segway Roller Derby, NYT Sat. Crosswords (in Sharpie!), Ostrich Grooming.
"If you see scary things, look for the helpers-you'll always see people helping."-Fred Rogers
If you actually follow that URL, you'll be redirected to a random spammy site. I've been redirected to a site that tries to get me to install an "updated version of Chrome", which is almost certainly malware.
It's not very likely that someone follows the link as it is not clickable, but it can certainly happen due to curiosity. Some users might suspect SE to have hidden an easter egg there.
Mentioning a URL in the profile placeholder that SE doesn't control and that leads to potentially harmful sites is just not a good idea, even if the chance of people following that link is small. The URL should be changed to a domain that is more trustworthy or just removed entirely.