Except that it mentions several key insights that the founder used to exploit market opportunities. She clearly has solid domain knowledge that allowed her to

Except that it mentions several key insights that the founder used to exploit market opportunities. She clearly has solid domain knowledge that allowed her to buy low and sell high, through not just thrift stores (which is labor intensive, but certainly not a new concept), but also identifying people who didn't have her expertise and thus didn't appreciate the value of the goods they were selling. It also sounds like she had a model that allowed her to build an engaged userbase and enlist them to help her build the business. Granted this is all just what one article says, but this is exactly the sort of thing you're supposed to do as a start up of any kind. Sounds like a relevant success story to me.