Banks are studying the idea of using clients' phone call and location records to decide about loans.

The algorithms used to evaluate the call records would be created by "machine learning", meaning they are opaque. Thus, a bank could easily develop an algorithm that effectively discriminates based on race, without making it explicit. It would be easy for some algorithm to use the phone data to produce a result 99% equivalent to "You're black" or "You live in neighborhood X".

We must make it illegal for banks to ask for or obtain these data.