Can an anime be in English only? I was wondering if it's legally possible for an anime to be spoken in the English language only. Sure a Japanese dub can be optional, but in terms of main dubbing, can anime have English as the main dub?

I know such anime may not even exist, but I'm wondering if there's any law or regulation preventing anime from being dubbed in English only. And when I say anime, I mean actual made-in-Japan anime, not anime-styled cartoons produced anywhere else.
There is absolutely no law that specifies that an anime can only be in English.

I will state that this is incredibly rare, given that most anime are actually made in Japan for a Japanese audience (hence why they're in Japanese), but given that the Afro Samurai anime was released in English-only, and it and its original manga source work was originally made in Japan, this only goes to demonstrate that there can be no law against this.