The creator is not involved with this propaganda. This is more representative of how one group will select a character, well respected and liked by kids, and then turn him into something he was never intended to be. This takes the 'syndicated' SpongeBob out of the mainstream and uses him to convey an alternative lifestyle message to those "who trust him". Got it?
It's an old, time honored trick that has been used with various characters from Sesame Street, to promote Aids Awareness and condom use.
How do they get the permission to use the character? Spongebob's agents obviously don't care that his image is being dragged into the toilet.