[nyanpasu64]

You can hide the Windows 10 lock screen ads: https://www.windowscentral.com/how-remove-advertising-window...

Not sure if it works on all Windows 10 editions though.

[jrockway]

Ah, I see that now. It came back after my reinstall. (I'm good at turning off Cortana and sending my web browsing history to Microsoft. This one I missed, however.)