The audience is whoever understands it, either by talent or by a translator.
It's really not about excluding anyone in particular as much as it's just that there are more than one language in the world and sometimes you want to use another one.
I speak a couple of languages personally. I tend to post mostly in my native language and sometimes in English and two other languages.
I have friends from various countries too.
I don't deliberately exclude people by choosing one language over the other, it really isn't about them, it's about me. I don't want to rewrite all my posts with 3-4 different languages and I'm not gonna stick to just one language all the time.
It's completely fine to comment if you happen to understand it or have translated it
if I want something to be private, I don't make it my status.