The preceding open letter to Organic Maps shareholders gives some context for the decision to fork.

The Organic Maps project has been built and promoted under the premise of being an open community project, so it’s troubling to discover that the majority of shareholders consider it to be their sole property. More concerns include lack of transparency and accountability in project governance and violation of stated Free and Open Source Software values. (see Addendum for the details)[…]

Interesting and troubling read, didn’t know that about Organic Maps.