Typical shitty reporting from Bloomberg. Other than the dollar amount outstanding, there's nothing else in the article that draws any similarities to the junk bond market. It's about as meaningful as saying "Apple's market cap approaches the size of the US junk bond market" or "Student Loan Debt surpasses Apple's market cap in size." In fact, there isn't really any interesting information in the article at all. There seems to be an insinuation that the size is a bad thing, but even then they don't come out and say why.