I would like any message that is spam to be able to be traced back to the offending human.
I would like anonymous political posts to be untraceable by the government.
I can't even get all of what I want.
The problem of the government tracking down people for political posts is supposed to be solved by having laws that constrain the government, not by having corporations provide anonymity as a service.
There's no "supposed to" here. Humans, (including governments) are inclined to do bad things; both law and technology are necessary to restrain those tendencies.