But do you know 5miles? Or Letgo?  Or OfferUp or Neerbuy
  or Saily or VarageSale? These sites are a visual
  marketplace, showing pictures of an item but often 
  including few words to describe it. They offer the seller
  anonymity while making it hard for police or others to
  search the web for keywords. Lost a bike? You could spend
  hours scrolling through pictures across more than a
  half-dozen sites trying to track it down. Then do it
  again the next day. These sites may sell legit
  merchandise. But they’re also the 21st-century way to
  fence stolen goods.

This makes it sound an awful lot like these sites are knowingly - or at least with a Lucille Bluth wink - catering to people fencing stolen goods.