I've been using Trakt for years, but their big price hike, and especially the "bait and switch" tactic they pulled, which essentially killed the basic list functionality for free users, left a sour taste in my mouth.

Simkl is a nice option that has most of the functionality I need, but they also have the custom list functionality as a paid feature.

But yes, what we need is a Fediverse service! 🙏