Free speech is like encryption at this point. Sure, it's not technically illegal, but if you actually try to do something for the public to use then the system will find some way to make it impossible and shut you down.
I admit that I also enjoy riling up first amendment fundamentalists but it isn't my main goal and these are my sincerely held beliefs so I don't think really qualifies as trolling.
Putting the potential straw man aside, wouldn't you say that your definition of a 'myth', whatever it might be, is ambiguous to the point where you can accuse anyone of spreading myths and disinformation, even if they're factually correct? For example, let's get everyone offended and say that someone could say that George Floyd getting killed by police is a myth, because he was killed for resisting and being a criminal, and it wasn't a bad thing at all. People cast a moral judgement on this event, so in a way it is a myth, is it not? Or is it when it's something that contradicts your own moral judgement?