Company A and Company B both use the same FOSS application. Company A has internal devs that add/fix the FOSS, but keep those updates internal. This gives Company A an advantage Company B does not get. Company A managers recognize this, and feel that since the updates were made on company time, they do not have to provide that to the rest of the world. Company A devs commit their updates to the repository, and now Company A mangers feel like they have given away work product for free. Lots of way pointy hair bosses to be upset in this scenario.