Maintainer of the Alpine package referenced here. It's called `glibc`, makes no claims on Alpine Linux and certainly isn't a Linux distribution. You install the package in Alpine Linux, nothing else.
Most people's experience with alpin is through containers. Given you provide `alpine-glibc` containers is likely where the confusion comes from. If you don't know the backstory one would easily assume this is an Alpine endorsed container.
I don't provide "alpine-glibc" Docker images or containers, so I don't really know what you're referencing here. I maintain an Alpine package called `glibc`. Please enlighten me!