But it's literally in Cannabaceae, the same family that contains Marijuana (as well as the Hackberry tree). It makes sense that similar compounds would arise in related species, as that is how phytochemistry works. I'm sure cannabinoids are in the foliage of hackberry trees, too.
They are acting like they found cannabinoids in, like, a grass or something.
That would be interesting if liverworts contained them too. They're very very unrelated to the hemp family, and in fact they're not really closely related to any flowering plant families, but I'm not saying that to say that you're wrong, I've actually never looked into that before. I just think it'd be interesting if cannabinoids developed in liverworts, because that would imply that those compounds evolved independently.