It’s certainly good PR for them, but it’s also simply a nice thing to do for somebody whose time might be limited.
It would have been easy for Disney to have made this sort of thing a one-time occurrence with Star Wars.
Having done it once it was guaranteed that others would ask for the same favor, but the studio seems more than willing to continue to honor such a request.
There are probably more people in the world who would like this sort of treatment than can possibly receive it, which is the only unfortunate part.
…
7 Major Things The Avengers: Endgame Trailer Taught Us