[6] Though the WTFPL is untested in court, the official website offers a disclaimer to be used in software source code.

[3][better source needed] The text of Version 2, the most current version of the license, written by Sam Hocevar:[4] The WTFPL is not in wide use among open-source software projects; according to Black Duck Software, the WTFPL is used by less than one percent of open-source projects.

[7] Examples include the OpenStreetMap Potlatch online editor,[8] the video game Liero (version 1.36),[9] yalu102[10] and MediaWiki extensions.

[17][18] OSI founding president Eric S. Raymond interpreted the license as written satire against the restrictions of the GPL and other software licenses;[19] WTFPL version 2 author Sam Hocevar later confirmed that the WTFPL is a parody of the GPL.

[20] Free-culture activist Nina Paley said she considered the WTFPL a free license for cultural works.