Idea for an app:
Using The Movie DB, one would:
Add a movie to their watchlist over time. The idea is that it would reduce decision fatigue and let a computer randomly pick from a list of movies you know you want to see.
Using an app (similar to my Goodreads Random app), it would pick a movie to watch, then show the streaming service it's on.
The TMDB API does not seem to list which streaming services you've chosen.
If one could filter just to the streaming services you subscribe to, then the app would be more useful.
This would rely on the less popular TMDB service, rather than Letterboxd (which does not have an open API), but at least TMDB does have a watchlist (and is the data source for Letterboxd), and has streaming service info from JustWatch just like Letterboxd does.