They send more than that, have you checked out the code? Every time you do an install Google gets to know about it: https://github.com/Homebrew/brew/blob/acc9a7ca8554bc2413dee2...

Maybe this is sufficiently private, maybe not. I'm not a security expert.

Maybe GA's fingerprinting heuristics are advanced enough to know that because user 1034324234 installed spacemacs at 4:01 and I visited the spacemacs documentation at 4:01 that there's a decent chance I'm user 1034324234.

Decent enough to see if the pattern happens again. After a few rounds of this, it's close enough to serve me ads based on user 1034324234's install patterns.

:shrug: doesn't sound crazy to me.

It's on my PC.