If you make a Declaration of Friendship, there are many bad points:
- Your friend will regularly ask you for money or Resources.
- It will negatively affect your relationship with your friend's enemies
- You cannot Denounce your friend or Declare War on him or her without incurring diplomatic penalties with all other Civilizations.
- If you do anything to annoy your friend, e.g. not agreeing to his/her regular demands for money, then he/she will usually Denounce you and this will negatively affect your relationship with all other Civilizations ("Your Friends found reason to Denounce you!")
There don't seem to be many good points: 1) it will positively affect your relationship with your friend's friends
So, is it worth publicly Declaring Friendship at all?