Why things like Multi-Lang. support are not important?

Web is mostly in English , I get it. But why so many websites/services or apps only launch in English, regardless of their budget? I know project with billions worth aand their website not even support other languages. They have a page to change language and it's broken for months. They have at least 200 FT workers and they're global company too. I don't get it. Can anyone explain it what am I missing?