What I think could be done is to develop a fork of Bookwyrm with the same features, but some key differences that make it the go-to solution for tracking movies you want to watch and that you watched, as well as sharing your thoughts with your friends. I already emailed Mouse Reeve, Bookwyrm’s creator and main maintainer, about this possibility.
I am keeping notes concerning this idea:
Unfortunately, even though I am a Fediverse enthusiast and I cannot stop talking about it with everybody, I am no developer and I cannot practically start working on this, also because my time is too limited to work on such a software. Nevertheless, I hope writing this post could inspire somebody to code something and start a Fediverse platform for movies!
Of course I am available for anything else concerning the project: website creation, marketing, bug testing and community moderation, etc.
The problem could be is image rights for movies, pictures of actors, logos etc. While common sense would say we are using these assets for the common good to promote / inform people about movie information. The image right holders seem to not understand fair usage or common sense, and would, in what it seems some cases reach for the hotline to their lawyer before looking at something in context.
I do support the idea you are proposing though, sounds good.