“Supported by Google” doesn’t communicate “owned by Google”, and anyway, marketing text in the middle of the page is not particularly telling. I expect a site about some technology to have an About page with some information about who is behind it and who funds it.

Compare https://go.dev/project which explicitly mentions that Google runs the show. The front page makes it clear that Google runs the language’s cloud infra. Plus there’s the Google logo in the footer.

The Flutter page never mentions who runs it. If it’s independent but sponsored by Google, there ought to still be people involved. If it’s owned by Google, it should be clear about it, and not just indirectly mention it.

I had to scroll for fourteen whole seconds on my phone to reach that part of the landing page. Completely invisible if you ask me.