Other private Musk companies (SpaceX and xAI) just bought fleets of Cybertrucks. One may wonder what exactly they would do with so many vehicles other than boost Tesla's share price.
Musk's companies buying hundreds or thousands of Cybertrucks is of course good for Tesla, but the impact on finances (and the stock price) should be minimal. Tesla has the capacity to make ~30k Cybertrucks/quarter, and it seems they sold only ~5k of them in Q3. So unless these companies would buy thousands of them per month, it's nothing.