Say you created a website and it's open-source under MIT.
A month later, I changed it to GPL-3.0 License.
A month passed again, someone forked my project in GitHub and is making money off it via donations (buymeacoffee). He removed the license in his forked repo's README and just added a section where he credited my repo.
The website I made also uses libraries under the MIT license.
Also, a local news site featured him, where he claims "he started to build the website out of boredom and took him three weeks to build" without mention of the original author.
What would be an ethical solution?