Why are you disillusioned with the business?
Why do you feel that simply giving half the money to charity somehow makes it okay to continue working in an industry that you currently see in a negative light?
Do you think you could make a staffing firm that would solve the issues within the industry such that you would stop feeling negatively about it?
I'm all for some charitable giving. I think that helps make the world work better. The world needs some means to help those folks for whom life simply isn't working for some reason.
But I generally feel that when people see regular paid work so negatively and their answer is to do the same work, but give away most of the profit, then this suggests the system is broken. Something is fundamentally wrong. A new model is needed so people can feel that their paid job actually matters and is a positive thing.
Best of luck.