1,282 people are the primary owner of at least one file in FaserF/qmk_firmware_master, and Ryan owns the most: 646 files, or 6% of the codebase. The truck factor is 45: that is how few people would have to leave before the majority of owned files lose their owner. 4,402 files have exactly one contributor, and 2 modules are dominated by a single person.
Engineering-leader view of who owns what: silos, hotspots, dead code, and bus-factor risk by person.