1) Would you personally accept closed source software dealing with your bitcoin transactions running on your station? (in that case I'm going to send you that credit card utility I told you about)
It depends on the source.
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2) Would you recommend to anybody else to use closed source implementation of the bitcoin protocol? (not yours with your backdoor to make a buck 
I mean third-party software)
I mean third-party software)It depends on the source.
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3) If you would not use closed source yourself and did not recommend to others to use such a software, what good is an option to fork existing implementation and make one?
Question invalid due to previous answers.
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See? Real easy .. I do not see any reason why would you want to fight a battle against GPL, why would you be against GPL? It makes no sense.
Anyone who says "why would you be against GPL? it makes no sense" is a zealot. Each licensing option has its own time and place.