Putting aside the whole idea that Elon "bought" his way into this position, it's crazy this is the path that Trump is taking. He has a house and a senate that would likely happily cut all these programs, and it could be done legally and without all this mess. Why let Elon run roughshod over the government?
It's in the Project 2025 playbook. They're trying to overwhelm everyone so you can't possible keep track of all they're doing. Store security could handle one shoplifter at a time; but when you have a riot and mass looting - you have fewer options and often just step aside and let them loot. Then deal with the mess later.
Also - he's a narcissist and he wants all the credit.
Also - he's a wannabe dictator, and on his way to making it a reality, so he's demonstrating that he does not need permission or help.