John Mueller from Google said that the Google search team is very strict with Google's internal SEO team. He said on Reddit "I imagine the SEO team at Google has a pretty hard time comparatively, given how strictly we separate the rest of search from their side."
Here is a screen shot of what John said on Reddit:
We covered once or twice about Google's internal SEO and back then we said they don't get special treatment.
Forum discussion at Reddit.
