Business plan, business model, customer research, advances already made, further along, ... There are dozens of possible reasons to loan $500M to Tesla, but not to another company.
There are dozens of possible reasons why you would loan $1000 to one friend, but not to another. Someone else wouldn't know those reasons, but if the friend complained about you being unfair, you would be quite miffed if someone went on the internet complaining how unfair you were, based on treating two people differently, without considering that maybe these people actually are different.
These companies may be alike in trying to sell an electric car. That does not make them comparable for the purposes of giving them a loan.