Paid-for internships such as this one or Amplify Trading can even be a negative as they are a signal that you didn't make it into a “normal” (read: competitive) internship.Wow, that's interesting. It's possible that I will need that book at some point.
What do you think of companies such as "Into City Prep"? They offer a paid internship (in the sense that I need to pay them) and guarantee I will find a job after that. It is worth mentioning that they were among the fastest in replying to my application :D