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I disagree on this. A senior developer in any language will make far more, 2x-3x, what a junior developer will make.

There is a hard plateau on how much you can make as an employee though. If you can build something and own the business, it's unlimited.

There’s also a floor when you’re an employee. The floor for an entrepreneur is $0.

Yes, you should have some sort of income, hence I'd recommend working for others until your own business makes enough to support you.

Can make.