Just under the ribbon bar, where little notifications bars sometimes show useful information such as when a file is read-only or if a file needs to be Checked-Out to edit, a grey notification bar popped up an Information icon (blue circle with an 'i' in it) with the following text:
TAKE YOUR FILES WITH YOU View, share and edit files wherever you are with the OneDrive mobile app.
Followed by a button labelled "Download OneDrive".
This is on my work laptop, which has OneDrive installed and running.
I don't like this. Maybe I'm oversensitive because I also don't like OneDrive and I don't like advertising. Is this new? Slippery slopes aren't a valid point of argument, but this is yet another step, of many, down said slope.
No, Office has been like this since 2016, where you can only autosave on OneDrive.
... or change MOTD (/etc/default/motd-news)
I'd rather bash Ubuntu for more controversial actions, like pushing snapd by default. Or pretending apps are .deb packages while they are snaps in disguise.