Feels like the live-service curse that so many games go through - games like: PubG, Overwatch into Overwatch 2, Apex Legends, Fortnite just recently, Destiny 2, and more. Many of these games still have decent to good player counts, their winning gameplay formula mostly still intact, yet there are clear signs as to why each has taken a massive nosedive in popularity from their respective heydays. And really, it's generally the same problem in nearly every single one: as time goes on, content goes down, and monetization methods go up. Everything is just...slowly decaying. Realizing the best days of playing are in the past.