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.