Sounds like the true libertarians need to trademark their name so these leftists can't co-opt it then, just as we see in the article of this thread. Firefox only trademarked their name and icon, but they did stop the illegal poaching of them.
I'd like to do the same thing with "Republican," but then most of the "Republicans" in our government would have to find a new name.
No more than conservatives or any other group. There are tons of lefties here who co opt conservatism.
The information on what truly is libertarianism is readily available for the sincerely interested.