[alpaca128]

> potential readers should know it's fake.

If potential readers cannot differentiate between reality and parody they're either deep in a conspiracy rabbit hole, or reality has become too crazy. Both these cases would again be a valid reason for parody to point out this fact.

Jokes work by surprising the audience. Pretending to be someone else before revealing the truth is just one method of doing this, and requiring to label it as parody is like explaining the punchline before the joke. The Onion recently wrote an actual legal document on exactly this and how required labelling of parody violates free speech.