@purple The 2 "WTFPL" licenses are poorly written informal licenses.

It is unclear if version 1 even gives you legal permission to modify or distribute software or HTML pages, or anything else.

Version 2 is not as bad, but it's still legally questionable and if you apply it to software, technically you are giving warranty for the software, as you haven't disclaimed it (although if such warranty claim somehow ended up in court, a judge would most likely conclude that it should have been obvious that there was no warranty, or may not) - the website FAQ advises that a warranty disclaimer is added in the source code if it's used for software; http://www.wtfpl.net/faq/

https://www.gnu.org/licenses/license-list.en.html#WTFPL