Pixel devices do not come with stock Android, and they certainly don't come with a build that allows for opting out of cloud services. They include a wide variety of Google "bloatware" that cannot be removed, much of which is also included on many other OEMs but some of which is unique to stock Pixel builds of Android (i.e. not public or open-source). Most all of the newer Pixel-only features fall into this latter category and usually involve some type of telemetry, in my experience.
Micromax devices and even Motorola devices come with Stock android. Nokia too (but they are pretty bad)