Some inspiration for what to include/how to phrase the rules:

• “Be nice to each other”
• “You are allowed to share your opinion. Others are not required to like it”
• “Accept that others might have different opinions from yours, just as you would want them to accept that your opinions are different from theirs”
• “Moderation is based on how you say things, not what you say”
• “Free speech has legal limits in most jurisdictions. The instance owner may be forced to remove illegal content even if they agree with you.” (for example, saying that all billionaires should be killed may or may not be a valid opinion but it may be considered incitement and depending on where you live, instance admins can get in trouble for not deleting it)