This is an "ad" in the same way the MS Teams icon, or OneDrive icon in my system tray is an "ad". IMHO these are not ads in the traditional sense and this concern and outrage is completely unwarranted.

When my iPhone tells me to upgrade/pay for iCloud is that an ad?

When I ask my Alexa to play a specific song and it tells me I need to upgrade to Amazon Music, is that an ad?