You're learning Django, and the error messages are in English.

There might be a Dutch programming blog talking about this error message, but they'll never be able to be discovered because any English source will end up on top.

Another example: you are traveling in a foreign country, and don't really know the local language. You Google for information about a restaurant, hoping to land on something Trip Advisor-y. You end up on the local website, that you're completely unfamiliar with.

You want to offer a blog for English-speaking expats in Paris. Your exposure in Google is really low because of the niche audience, and the fact that French sources about places you're talking about will be much more viewed.