Sure you can create content with free open source tools and yeah there are some oss runtimes. But the runtime that the majority of the world has installed is c

Sure you can create content with free open source tools and yeah there are some oss runtimes. But the runtime that the majority of the world has installed is created by adobe. If a new platform/os has a new feature, you still have to wait for adobe to support it in the vm. So no, flash isn't really that open. Adobe controls and drives its direction.