Prince Harry move to Montecito increased property values around his house (https://nypost.com/2021/03/08/montecito-home-next-to-prince-...). I am sure many luxury buildings in any city would be happy to rent apartment to him for free just for publicity it will generate. This is equivalent to having Google/Apple on your resume.
Also I think it's pretty clear this discussion does not pertain to corporate or celebrity tenants.