"Chumbox" has been a descriptive term since 2015:

"A Complete Taxonomy of Internet Chum" (4 June 2015)

<https://www.theawl.com/2015/06/a-complete-taxonomy-of-intern...>

<https://en.wikipedia.org/wiki/Chumbox>

Cool Wikipedia read. These (chumboxes) are on our Windows 10 lock screens at work.

Wait a minute, what? What I read from your comment is that on your work machines the screen savers display ads? I mean, I’d heard Windows was getting bad with the ads, but surely it doesn’t work that way out of the box.

On Enterprise, configured by policy, no less, one would assume.

That is an absolute stone cold dead soul-sucking statement.