Will GitHub Card be open source on GitHub? If so, when? If not, why?

Thanks for asking! I understand the appeal of open-sourcing.

In fact, I've been involved in open-source projects early on, so I'm well aware that open-sourcing comes with greater responsibility, commitment, and honestly, along with more pressure and maintenance overhead.

At this stage, I don't have the bandwidth to maintain it properly. I prefer to keep things relaxed and maintain full control over the development pace, which is one of the best choices for me right now.

Of course, if I have more time in the future, I'll definitely consider open-sourcing it.