If you’re inside Google, do you have access to api definitions or source? There must be some raw result before they apply all the various removals and cosmetic (piracy ban) weights.

It seems like you would to test with this to assess quality.

Possibly. But aren't everyone's google searches already customized when you are logged in to Google. If people at google don't have special options, then how would they know they get a special (ie. better) type of search. I wonder how many people have access and understand the full search source code at google (less all the machine learning stuff)?

In older versions of google, one could quote a full error message of almost any type that came up on your computer and get a very good page describing that that error meant. Now that is not the case. Maybe the internet has degraded and this is no longer possible, but I would imagine it would really help out google coders if they had a system of searching the web for error messages that worked (and quite a competitive advantage if it only worked for them).