It can still be forked. There is no salting the ground here. If you maintain the project and have for a long time, and you wish to stop, you can stop.

If no one cared enough to support the project, why does anyone care enough now? It all sounds hollow. Nothing bitter about it.

When you work on a project, any project, you have a responsibility. At some point we all can stop, and become free to not have that responsibility.