There may have been other reasons as well, but I have been strongly inclined to consider this a hostile and even malicious action (organisationally, if not individually) from the start, more than the maps.google.com → www.google.com/maps shift (though I think it’s still at least hostile).
Thus you probably can’t quite block even www.google.com even if you never use any Google services yourself.
Gmail is currently branded as part of Google Workspace, and shows the Workspace logo upon sign in. It probably has been that way architecturarly for a long time, but I think they have made it more explicit relatively recently, at least for non-corporate users.
It looks like "Google for Work" is an old name of Google Workspace.