What is it like to be the richest man in the world? Elon Musk: I just feel like it's easy to make money, Tesla is just a small business for me. 
There is nothing wrong with what Musk said, purely from the point of view of technical difficulty, Tesla is undoubtedly a relatively difficult enterprise under Musk, and other companies that are doing it, such as brain-computer interface, spacex, Starlink, Sun City, hyperloop, etc., some of which are too difficult, such as hyperloop, have stopped researching.
In addition to his own projects, Musk was also an early investor in OpenAI and a staunch supporter of open source technology, but later it became clear that OpenAI transformed from a non-profit organization to a joint-stock enterprise, and it was only after making enough money that it could become an open source institution again.
Musk has now become the richest man in the world with Tesla and SpaceX, and in the future, whether it is a breakthrough in space technology or a breakthrough in brain-computer connection, it will bring him countless wealth.
For him, making money is indeed quite easy, of course, this is also risky, and if it cannot be commercialized, it is only possible to keep burning money, but money is basically not a problem for Musk.