What is the end goal of Musk's access?

Basically the title. What's the goal? What's the justification? How is this being allowed?

I feel like every day, there's a new headline about Musk gaining access to another database or department's records. Like... why? What purpose does this serve? I'm WAY too dumb to understand the extent of what info he has now and what the ramifications are, so if there's any data/systems analysts out there, please explain like I'm scared AND explain like I'm 5.