My belief was that free throws were always lineup up M2M.  C vs C, PF vs PF, FT shooter vs Whoever is his positioned opponent. This was just my belief though and there is no evidence to back this up obviously. I suppose I (along with many other people) haven't really thought much into it. Good question.
                                
                                
                                
                                
                                
                                
                                    Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs