Intellectual property law changes worlds and gods!
In 2001-2005 years D&D adventures of the Ravenloft setting was been creating by White Wolf Publishing under the license issued by Wizards of the Coast (the owner of Dungeons & Dragons). However, the license didn't cover the pantheon of gods of the classic D&D world Forgotten Realms...
License provisions from the real world left a significant footprint on a virtual world that is sometimes a quite real for players. So just think about new worlds that are created now and will be created in future, that become more and more important than the real world for our society.
Just think about the influence of IP licenses on these worlds.