And network infrastructure, isolation between customers, scheduling hardware allocation, etc etc running one own data enter is quite different than inviting all sort of third parties in.
The key difference between this goal and SpaceX is that Elon Musk bought a private space company that already had the know-how and the market presence in a market with virtually no competitor.
In this case, Tesla is posting wild claims about developing the whole vertical integration of the whole tech stack barely over mining semiconductor raw materials, with which goal? Competing with the likes of AWS, Google, and Microsoft, on a very niche market?
Digging holes in the ground is hardly rocket science as well.