Visa Inc. Sr Software Engineer interview questions

Initial contact with recruiter. There were no slots on his calendar left so I asked about this and he never responded. The job posting was gone when he sent the email. Several weeks later he sends the same exact email, and this time I was able to schedule a call. The rest of the process was relatively normal, although I saw the posting go back up and then go back down. Fast forward to the final round, I was informed it would be coding and system design. Instead I got coding and trivia questions. The trivia questions I had no idea how to answer because they were out of the blue, and it would’ve been nice to prepare for them. When I got rejected, I saw the job posting went back up. This made me pissed. Are they really hiring? What’s the purpose of taking the job posting down, reposting, and continuing the cycle? Don’t rely on Visa for getting an offer, there were so many red flags in the process.