I found this app today and thought I'd share it here.
The problem which I was trying to solve was the removal of the click-bait captions on the Windows 10 lock screen pictures. Windows downloads these (often beautiful) images for the lock screen but then covers them with these little spammy captions/links like "You'll never believe where this island is..." and baloney like that. I thought i might find a registry key or something to get rid of these, but I failed—it seems the only option was to stop using Spotlight, instead choosing my own pictures for the lock screen.
Until I found the app (I'm using the shortened word intentionally) "Dynamic Theme". It's available, free, from the Windows App Store. It has no ads or anything.
What this app does is download (from somewhere...) either the Bing or Windows Spotlight image each day, and set it as your lock screen or desktop background. So it acts as a normal picture (indeed if you check in the windows settings it is set to "Picture") This means no more silly captions; the ability to set these pictures to the desktop wallpaper is a nice bonus that I've enjoyed. The program will also archive the downloaded pictures in a folder of your choice, if you wish.
You can try it by searching in the windows store (or just typing "Dynamic Theme" in the start menu), or by going to its page on microsoft.com