http://www.gnu.org/philosophy/categories.html
/*
“Commercial” and “proprietary” are not the same! Commercial software
is software developed by a business as part of its business. Most commercial
software is proprietary, but there is commercial free software, and there is
noncommercial nonfree software.
*/
Free Software can be commercial software. The business model usually is just
different between proprietary software and free software. Most Free Software
games does only get donations, however, that can be more than they might get
if they released their games as proprietary software.
There is also one "commercial" MMORPG which is Free Software.
