Have you ever found a GitHub repository with an interesting R package? Probably yes. Probably, it also happened that you didn’t have access or willingness to launch RStudio and try the code from the vignette. Even if not, there are many lazy busy people who don’t want to don’t have time to do this. Users would like to have an easy and effortless introduction to the R package, at the same time package developers would like to encourage as many people as possible to try out their tools.