I do not know how the author's application retrieves Facebook photos, but I believe that Facedown (which was a desktop application, not a web app) was shut down because not because it was saving photo albums, but because it required users to input their Facebook credentials into it and tried to download photos by scraping album information (by pretending to be a web browser).

I have operated a reasonably popular Facebook application that has similar photo saving functionality (using their API), and not have not run into any issues. It has transformed from a desktop application using the REST API to a Graph API using web application at http://socialphotodownload.com . Unlike Facedown, I try to follow Facebook's Platform Policies.