Elon Musk has $600-700 billion, so it’s very unlikely that any game you’ll ever create will make you that much money, even if they’re really good. I may be misunderstanding that part of the post, not sure. Do you have $100 to publish on Steam? But you can make a paid game and publish it completely for free on itch.io and earn income there until you make $100 to publish on Steam? But the money is refundable once your game makes $1000 in revenue.
But a part time job is a good way to make the money to publish a game on Steam. Unity itself is completely free for you to use until you make something like $200,000 in revenue. So unless you’re going to be paying for a lot of assets or audio, Steam is probably going to be your biggest expense. Not sure if any of this helped.