I think the only thing you can do is to be up front about setting expectations very clearly and prominently in the project. If it is a large project relied upo

I think the only thing you can do is to be up front about setting expectations very clearly and prominently in the project. If it is a large project relied upon by a lot of people or businesses, that's when you start charging for support when the issue is mission critical, or you encourage others to do so and provide a link to their support business. The demand for free skilled labor is huge, and always greater than the supply.