The study says that particles of dark matter may have interacted with each other, producing other particles that heated the collapsing clouds. The heat kept the clouds from shrinking enough to ignite nuclear fusion.

I was watching the History Channel tonight and there's a
type of star called a 'Brown Dwarf'. They're incipient stars,
or stars that didn't quite come into being. It was part of their 'Universe' series.

Yeah, I've heard of that show. If I had cable, I might watch it. But I guess we could call them "black giants"?