Ask HN: Non-Citizen US Visa Holder Working on Charityware?

So I live in the US but on a temporary visa hence I can't have a money-making side projects. However, I really want to make this side project and have people pay for it in a way that X% of the profit goes to operating cost (AWS hosting, CDN,domain,etc which I hope would altogether would be small in comparison to revenue in the long term) and 100-X% would go to a charity. None of the profit would go to me since I have a full-time job already (and legally can't anyways).

I have several thoughts about how to do this and would love your ideas:

1) Is this legal for me? (This might be hard to answer)

2) Should I request for funds directly or make it an honor system? (this possibly negates me having to worry about question 1).

3) Has anyone done this successfully or something similar?

4) Any other things I should be thinking about? Is this a foolish idea?