"Coming up with their own proprietary technologies" - Considering Dart is completely OSS and is being developed in the open and has a goal to standardize the la

"Coming up with their own proprietary technologies" - Considering Dart is completely OSS and is being developed in the open and has a goal to standardize the language after its release, by "proprietary" I'm assuming you mean it was actually realized and physically developed by engineers and sponsored by a Company? Just how do you think software gets made?