Just as a thought experiment, what if instead of charging that 1% more, you asked them to donate that to that project?
If a business agreed to do it, there may be a chance that they would keep donating after you stopped being involved in the project.
And also the business could appear as a sponsor of such project and get some good publicity.
I don’t think there are many businesses that would agree to something like that, but I’m pretty sure a few would.
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