Anonymous from whom? I think you should keep in mind that once 3 letter agency is on you then you'd rather be as famous as Kim Dotcom. At least then you have a chance of some people or organizations like EFF helping you.
If you're "anonymous" they could just charge you not just for your words in public, but for awful reasons and nobody will stand for you since you're just overall ciminal.
First they'd have to find me. And I don't mean as Mirimir. I'd be easy to find, for a TLA. But other personas, I could make them very hard to deanonymize and locate. I've studied many of the major takedowns over the past decade or so. And they all involved quite obvious failures. I wouldn't speak English, for example, but rather another language that I don't use often,
While this is a fascinating subject in theory, in practice I can't imagine deanonymisation is really that hard for three letter agencies, and to a lesser extent five eyes et al. Especially if you paint a large target on yourself like OP claiming to have monitoring capabilities on his network.
I'm going with the "be famous or be afraid" school of thought of your parent comment.
And like Tor, it's primarily a framework.
If I were doing it, I'd rather be anonymous. But then, I'm just very cautious.