While the platform may be open source, the product may not be. We have products which are completely open source, but the one being used for the Nest Hub is not

While the platform may be open source, the product may not be. We have products which are completely open source, but the one being used for the Nest Hub is not. This is similar to the idea where you may use Linux for the bottom half of an OS, but the top half may be something else entirety. Different products may make different decisions, but a common core is used amongst all products.