Demonstrate where any commercial software company has confiscated more code from any user than the Free Software Foundation has.
How's that?
Demonstrate where the FSF has. The thing about copyright infringers of GPL code is that it's much cheaper to just give up the added code than pay possibly millions in damages at court. Luckily for these copyright infringers, free software gives them that option, which so far everyone has taken. In the proprietary world they just have to pay up.
And, please, demonstrate where any open source license (as defined and accepted by opensource.org) attempts to quash the freedom of speech of the users the way Microsoft does.