I've never heard that these before. What's their use case?

Much more difficult to remove than typical stickers but don't presume that they are impervious.

You can use solvents to attack the adhesive and mechanically removing them with a flat bladed scraper of some description is still going to do the job.

Good for higher trafficked areas where people are inclined to opportunistically rip stuff down and where wheatpaste + makeshift eggshell-esque posters which have razor slashes through the paper aren't suitable. Cost is a consideration though.