alt Hacker NewsI've gotten my email routed to spam even though it never left the Google cloud. They don't say, "Gosh, this is coming from inside the house. Therefore it's trustworthy." Nope. The push legit mail from other Google hosted domains into spam without a second thought.
I've had emails from Google end up in spam and I'm using Google Workspace, it's driven by what people flag as spam, not domain trust.