The obvious implication is that your searches are being reported to some unaccountable authority.
I have no doubt that this creates a chilling effect against public discussion about these practices.
Ah that old chestnut, I am sure they have heard many worse excuses than that one.
"I wanted to get the Playboy channel, but I already have the cartoon network and if you have both they put you on a special list."
For the Hugin panarama suite one tool to find control points is named cpfind.
Civil Protections in Half-Life 2 is also often abbreviated CP. IIRC the are even CP violations mentioned in the Overwatch announcements, which would fit in with the series' physics references.
So many minefields...
If Google was doing its job, no search results would contain CP and they wouldn’t need to warn anyone. They probably shouldn’t warn anyone since all it does is alert people who might be looking for CP that they are being watched, and scares anyone who isn’t looking but their search terms have similar words.
The outcome is overall worse than if no alert popped up.