There's another side: IF the company does a great job, the OSS project becomes much more fruitful, however, if it doesn't do much of a great job, well you end up with MariaDB vs. MySQL and LibreOffice vs. OpenOffice (not sure they haven't bothered to merge).

At least the GNU does what it was intended to do, stop companies from hijacking / buying out a software product and getting rid of it entirely.