Do you have some examples?

Probably because sour would make your lips pucker? I think lemons would be more obvious.

Personally I would include it just so that the next homeowner doesn’t curse you when they go to drill something into an expected stud that isn’t there.

Loss of 3rd party data sales from the tracking embedded in their apps would be my guess.

Try threading a wood screw into the hollow pin until it grabs, and pull it out while twisting with a pair of pliers.

How would someone get started doing this?

This would make a good community, post news stories and have other people try to predict conspiracy theories about them!