You are thinking as if there were a "litigation in process", licenses are looked only if one the parties decided to sue, usually the "creator" or "author" of the work are the ones which are "suing" because he wants to gain royalties for the "work" he is done but in the context of WTFPL, given that "i license my work under this license" this non-existant because m licensing "my work" as something near "public ___domain" (if you accept the premise that even such us-specific legal term applies, which usually isn't) so pretty much all your question don't matter, there won't be a legal precedence if there isn't something to "sue" maybe for liabilities but this is something rare to see outside us.