Being fluent is a different question, you can dream in English without it being your native language.
first language = A first language (L1), native language, native tongue, or mother tongue is the first language a person has been exposed to from birth
You know, they weren't the one to bring it up and their point seems to have consistently been that the majority of the global population does not speak English.
Plurality of the world (25%) and a larger plurality of the internet-connected world (37%, [1]) speak English. (Granted, most of TikTok’s market now probably doesn’t speak English.)
[1] https://www.itu.int/en/ITU-D/Statistics/pages/stat/default.a...
Yes, we understand what a first language is. You should understand why that’s irrelevant to this discussion.