But using proprietary software illegaly is not the point of this topic.
Illegaly relicensing open sourced software to proprietary licenses without confirmation from every contributor to that certain project is.
Even Microsoft, Apple, Google and any other big corporation knows how to deal with open source, when to use GPL, when BSD, they even know how to make money on large projects.
But I don't think you'll understand this, so I don't want to waste my time to elaborate that further. But please, read more before doing such a thing, for your own good.