>but, nobody uses it.

I used to work at ByteDance and they alone employed I think more than 800 Flutter Devs. Douyin uses Flutter (the Chinese version of TikTok), Grab and Ebay use it, Alibaba and Baidu did too. Toyota and Volkswagen I think both use Flutter. Nubank I think is also a flutter app and they alone have like one hundred million some users.

With the popularity in the Chinese ecosystem alone there's gotta be a billion plus people using flutter.