There is a significant intrinsic cost to making code "open source", through the simple act of making that source code available at all. This overhead exists without any regard for what you wish or promise. It invites myriad interactions that cost time and money for little or no offsetting benefit.

Publishing source code, if anyone uses it at all, is not "free" in any sense. I know several people that stopped open sourcing their projects (not even businesses) because the cost of making their code available isn't worth it.