https://twitter.com/taodong/status/1141603862740008960 (thread)
Canonical saying Flutter is the future of Ubuntu desktop apps is something too, but I'm not sure how much it's caught on since when it was announced in July 2020.
If google drops support for flutter, the next design update by ios or android would kill it.
You lose that with OSS projects because you eventually end up with people screaming down your door and the visibility that brings. Also being assigned to work on these projects internally is career death. Both of these problems happened to Google Cloud's Terraform provider at some point and it was a headache for the company and the community.
Luckily Terraform adoption is out of Google's hands. They're just forced to play ball. OTOH, Google could easily kill off Flutter via other means.