There is no hidden fee, it is open source, everyone can see it and it is only a small amount ($ 1 / month, which is not the fault because it was loaded by third-party software). They removed that hidden fee and all the money has been returned. The miners are also receiving their money.
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This is not true. The money has not been returned and a btg developper implemented the hidden fee that was not listed in the readme (not a third-party software, you can check this here:
https://github.com/BTCGPU/BTCGPU/issues/180)
I can't belive there are still people defending this behaviour...