On one hand it's just a small percent of articles that are biased, so wikifreedia maybe not be needed for the vast majority.

But there are still a lot of "facts" on Wikipedia as a helpful starting point, even on articles with a lot of bias. It may actually help the final result be a bit more balanced/holistic.

I'm not sure it works exactly the same, but have you seen Rationalwiki and Conservapedia? I think both start fresh with a very politically bias POV, and they're both garbage (although good that they exist).