I think "you want to do a communication that can't be later printed out and used against you publicly" is the threat model. You can't really protect yourself f

I think "you want to do a communication that can't be later printed out and used against you publicly" is the threat model. You can't really protect yourself from the US government in any meaningful sense if they decide to end or ruin your life, but what I described above seems like a reasonable thing that people would want to do for reasons both legal and not.