https://www.techdirt.com/articles/20210402/14182646542/content-moderation-case-study-twitter-briefly-bans-russian-parody-accounts-2016.shtml

Summary: Twitter allows parody accounts to remain live (often over the protests of those parodied), provided they follow a narrow set of rules -- rules apparently intended to make sure everyone's in on the joke.

Here's everything Twitter users agree to do when creating a parody account:

Bio: The bio should clearly indicate that the user is not affiliated with the subject of the account. Non-affiliation can be indicated by incorporating, for example, words such as (but not limited to) "parody," "fake," "fan," or "commentary.” Non-affiliation should be stated in a way that can be understood by the intended audience.