From doing agency/marketing work for numerous large corps, I can tell you that many have a straight up block on corpname on any email name or domain to prevent phishing.
Yes, I recently got a new chromecast, which now requires a google account to set up via the google home app. I knew I was never going to use this single-purpose account for anything real so I decided to make the name very descriptive and tried to put “googlehome” in the identifier but google would not let me get away with the string “google” anywhere in it. Ended up with “GewgleHome.”