Ultimately, the problem is that most people in the world are bilingual.
Many Europeans are bilingual in two or more national languages, especially English. Most Indians are bilingual in a regional language and English and/or Hindi. Most Chinese people are bilingual in Mandarin and one or more regional Chinese dialects (which would be "languages" if they had an army and a navy).
English especially suffers from this misrepresentation, since so many use it as an interlanguage, and Mandarin benefits because so many people use it in school and official contexts.
But trying to visualize languages by speaker count without accounting for language boundaries and multilingualism makes for something that's more a misrepresentation than a representation.
Many Europeans are bilingual in two or more national languages, especially English. Most Indians are bilingual in a regional language and English and/or Hindi. Most Chinese people are bilingual in Mandarin and one or more regional Chinese dialects (which would be "languages" if they had an army and a navy).
English especially suffers from this misrepresentation, since so many use it as an interlanguage, and Mandarin benefits because so many people use it in school and official contexts.
But trying to visualize languages by speaker count without accounting for language boundaries and multilingualism makes for something that's more a misrepresentation than a representation.