What bothers me most about this is that these workers have a shift that essentially makes them invisible to the rest of Google employees. They come in many hour

What bothers me most about this is that these workers have a shift that essentially makes them invisible to the rest of Google employees. They come in many hours before the bulk of Googlers and they leave at a time when there is the least foot traffic on the campus. There's a clear intention to keep this group segregated and hidden from the rest of Google and that's a bit disturbing.