Is not accepting contributions the only/biggest issue you have with the project? I'm honestly becoming more and more okay with the "cathedral" style of open source. Depending on the project, catering to "the community" can lead a loss of focus, lack of a cohesive "vision" or scope, and just generally trying to be everything to everyone without the resources to maintain a giant beast.

With something like a browser (engine), I'm totally okay with someone saying "I'm an expert and I'm trying something with my own vision/priorities. I don't want input from random people that I have to spend time evaluating."

Commit activity actually increased after they blocked external contributions in June: https://github.com/LadybirdBrowser/ladybird/graphs/commit-ac...

That is not possible. Google, or anyone else, can make a fork of the project. But they can't take away the original from the commons.