I've published ~20 iOS apps. Only 4 make money, but they allowed me to reach financial independence and never have to work for someone gain at the age of 24.
That's great, well done, but without details it doesn't add much to the conversation. What are the apps? How did you market them? How long did it take to start seeing results? etc.
What's when your apps are removed from Apple for any reason? Do you have enough money to live without this income? Or do you need then just start over again?
Well he said to "never work again for anyone else", that does not discard working for himself.
I'd have ~2 years and not hurting my lifestyle. Hopefully it doesn't come to that, but I can get a job if needed