I can't count how many times I've submitted a patch only to hear my supervisors complain that I made a contribution to the thing that makes the business profitable.
I know you are deploying irony but due to competing interpretations I can't figure out its intent. Do you mean the supervisors do complain or they don't?
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.