I'm all in favor of some pithy term for "source released under an open license but not developed in full view of the public."
Or, "we take all the benefits, free workforce and goodwill of free software while retaining all control and money".
There is a spectrum here, not two distinct models of open source.
Projects like Python, Firefox, Linux (kernel), etc. are open source and developed in an open community manner. Decisions are made in the open, long-term plans are well-known, and anyone can participate.
Projects like Chromium are less open, some development is behind closed doors, the project is controlled by a single corporation, the decision making process is not transparent, etc.
Near the edge of the other side are projects like Android, which are basically developed in a closed way, then "dumped over the fence" when finished (which makes them open source at that stage).