11 people are the primary owner of at least one file in woltlab/wcf, and Tim Düsterhus owns the most: 3,162 files, or 43% of the codebase. The truck factor is 2: that is how few people would have to leave before the majority of owned files lose their owner. 5,046 files have exactly one contributor.
Engineering-leader view of who owns what: silos, hotspots, dead code, and bus-factor risk by person.