Don't people get job offers anymore from someone they used to know that moved to another company and then like "hey I know this really great guy who works at XYZ, we should definitely get him here"? That is literally how every job I've moved to happened, except for the very first one right after being a student. That's the only job I ever remember having to "interview" for. The rest were just through established soci…
Even the tech celebrities have to go through the process half the time too. You will get a referral bonus although if your friends pass the process although.
This is mostly done to prevent cliques who let in bad performers.