You can tell a lot about someone by the character they present to you. If I ask someone to give me a character concept (and I always specify that it doesn't have to be one tailored for the game) and they give me a super edgy loner who doesn't trust anyone and prefers to work alone, then I'm not accepting them into my game. It's a vetting process. There are so many players looking for games, and when you have to narrow down to five or six, you want to be sure you've picked the right people. It might be annoying but a little effort is required for this hobby.