Again you're predominantly talking products, Orkut was killed off in favour of Google+ which failed for its own reasons. Your example of Noop is weak, at its peak (which you couldn't even really point to) it had a minute fraction of the adoption of what Dart and Flutter has today. It was an experiment with absolutely minor resources put into it as a mostly 20% project, and basically wanted to be what Kotlin already was which had all the resources that came with Jetbrains full backing.

You ignore the points about Google's long term aims of control of a programming language that runs on all platforms. This gives them overall control of multiple ecosystems. Dart is the language that they are using to push Flutter as the framework for controlling whole ecosystems. Fuschia is the project they're going to push for to take over Android.

The webpage doesn't really add weight, because context matters and you are seemingly ignoring the entire context of the a) open-source nature b) business goals c) current adoption d) it's not a product, all to try a push a flippant opinion that doesn't really work when you understand the thought and ideas behind Dart/Flutter.

But you do you, enjoy and all the best.