I thing that people does not trust everyone easily and the signals you provide many be sometime worked but not all the signals work correctly so I think that all the groups which are created for the sake of providing signals to help others does not cooperate the whole time. Try for the first does not mean that there will always be success but the good thing is that you will learn from all the activities you do and you will never make such a mistakes which you have done in some previous moments
You can't trade in the financial market depending on someone's signal. Trading signal groups tend to give random signals, in which only some signals are successful. So your own trading knowledge is most useful in trading. As people get cheated by joining various trading signal groups, they now don't trust other groups either.