That [not supporting due to being closed source] makes no sense when the proposal includes open sourcing it

It is closed source NOW, and I do not support funding it NOW. If and when it may become open source, I will consider supporting funding it.

I don't support funding based on distant future promises with no clear milestones, visible process, and no recourse if the promises aren't satisified. That applies equally to promises of open sourcing as anything else.