Yeah, I remember, when I used to live in Texas, there was this “libertarian party” that had nothing to do with liber- but just ultra right religious jerks sucking for the Trump party.
And there was some “tea party” guys that were into libertarianism at the time, but really were Trump supporters essentially, just more sensible otherwise. The situation was unmeasurably stupid, considering how the whole idea of the US was about libertarianism and no movement really promoted its ideas, just “let’s regulate something else and make each others lives more miserable” things.
But then I’m pretty sure this theft of libertarianism is effective only in the US.
Don’t overestimate the cultural influence - it’s strong, but not that strong. And generally people are not all that dumb. And most people start search for political theory in native languages, which is quite rarely English, for lingua franca is tainted by this stuff like OP mentioned for the benefit of US political circlejerk.