Thousands of hours of video about the companies and their products, hundreds of hours of interviews with Musk, thousands of tweets by Musk, financial filings of Tesla and SpaceX, you can test drive a Tesla for free in most parts of the world, you can use Starlink in most parts of the world, you can ride a Cybercab in Austin, you can watch a rocket launch livestream or in person, you can watch videos about people who had their lives changed from Neuralink, etc.
I can't think of another person of similar prominence who has been as accessible as Musk. Partly due to the internet, but also due to his choices. I don't see Mark Zuckerberg, Bill Gates or the Google founders sharing their views & debating them with adversarial reporters on a regular basis. Perhaps Palmer Luckey is on track for becoming somewhat akin to Musk.