Because Flutter came from Google, I've never considered it.
EDIT: to those downvoting, this is a serious, sincere question:
I realise it's a UI framework, but are there any investigations into it phoning home/tracking users etc? Does it pull any resources from Google at runtime for example?
We don't pull any resources from Google (or any of the other companies who contribute to Flutter, like Microsoft, Cannonical, Nevercode, etc) at runtime.
During development time we pull binaries from Google servers (for lack of a better place to put them mostly) and source from GitHub, and as Tim said there's some analytics (there's a big message saying how to opt of analytics when you first start the flutter command line tool).
I know the web site says Flutter is "made by Google" but that's really underselling how much Flutter is a group effort by lots of contributors, a (very active) minority of which happen to work for Google.
The whole project is open source, there's no closed-source component, and lots of people build their own binaries, for what it's worth. So you don't have to trust me on any of this. :-)
We capture a small amount of analytics from the developer tool itself, primarily to help us spot and fix crashes as well as to help us improve the tooling. Completely anonymous, we prompt you on installation, and you can disable it completely using the command 'flutter config --no-analytics'.
Flutter does not capture or upload any information from users running apps compiled with it. The SDK is all open source, of course, so you can see exactly what we do upload.
Appreciate the transparency. But nitpick about terminology: telemetry over HTTP can never be "completely anonymous" by any stretch because of users' IP address being tied to it. Unless you're sending analytics over Tor...?
Flutter team member here. Valid nitpick, and I can confirm that we scrub any personally identifiable information (PII) from our telemetry, so while the IP is sent over HTTP, it's not stored in our system. We even go so far as to scrub the exception message, since it may contain PII.
EDIT: to those downvoting, this is a serious, sincere question:
I realise it's a UI framework, but are there any investigations into it phoning home/tracking users etc? Does it pull any resources from Google at runtime for example?