>> Do you think that I can do something by changing the license on my open source project?
You can do something about future forks by changing the license on your project. The existing fork was created under the current license on your project and you can not retroactively change that.
INAL. I'm not sure if there is much you can do. If you open sourced the project in such a way as another party can do what they want, we'll expect them to do whatever they want.
You can do something about future forks by changing the license on your project. The existing fork was created under the current license on your project and you can not retroactively change that.