English is a stupid language ¯\_(ツ)_/¯
Before the ambiguity of language can get in the way, there has to be a coherent idea that you want to express in the first place.
This license explicitly contradicts itself. It says you are encouraged to contribute changes to the source, and you may not share changes to the source with anyone ever.
As for English, because of its plain nature, I have little trouble understanding someone who isn't proficient or who has a heavy accent, whereas languages with specific infections or tones might not have that kind of liberty.