Yes. Realistically off by at least a magnitude. There is literally zero chance there's 1 million active developers working on this experimental Google Tech out there.
while I'd agree with you that 1 million is too high, Flutter certainly is not experimental Google tech. It's widely used in particular internationally. I talked to a ByteDance guy two or three years ago and I think they alone had about 1k Flutter engineers. Nubank, Alibaba, BMW, Ebay use it extensively.
Flawed metric but eyeballing VScode Extension installs, Python 140m, c# 30 mil, Go 15 mil, Flutter 10 mil. It is very, very popular.
