For "snapshot" binaries we have
https://bintray.com/eustas/brotli/bin/snapshot#filesUnfortunately, currently it is setup only for osx/linux artifacts. I can add it to appveyor workflow too, so windows artifacts will become available.
As for PGO - it doesn't seem to provide performance boost (in my recent experiences). But, perhaps, MSVC is much worse than other modern compilers, so it might be useful... But I have no plans for employing PGO in near future.