Signing in problem

If I understeand well, I have to put all my informations into register formular so I can make money by creating extentions.
What is I dont want to? What if I just want to make some extentions for fun?
Also it makes making extentions 18+. So I cant have great idea about extention and create it becouse Im not old enough?

Why there isnt some non-comertional registration? Im a little bit confused.

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Minors can sign up for it with their parents or another legal guardian.