The best argument is that complaining to your elected officials without restrictions or reprisals is constitutionally protected for good reason.
Further, it's not a good idea to prevent rich entities in particular from being effective at it because with enough resources, they will be effective anyway. So the ineffective prevention mechanisms will just end up being regressive and/or even more corrupt at the end of the day.
Further, it's not a good idea to prevent rich entities in particular from being effective at it because with enough resources, they will be effective anyway. So the ineffective prevention mechanisms will just end up being regressive and/or even more corrupt at the end of the day.