Nest was a Google subsidiary before Alphabet was formed. Across the street from their offices are Google offices. I've talked to Nest employees about their use

Nest was a Google subsidiary before Alphabet was formed. Across the street from their offices are Google offices. I've talked to Nest employees about their use of Google infrastructure, in a Google office. It didn't seem like there was any more separation than you'd expect of the Android and chromecast groups, for example.