Denuvo is an expensive service so games tend to lose it after a year or two. However some single player games that have more spread out sales windows tend to keep it much much longer. Doom eternal has a relatively short campaign and sales will drop off pretty quick after initial release so it loses Denuvo after a while. However, something like Assassin’s Creed has a very long play time and is the type of game people aren’t really desperate to play in day one so it Denuvo stays active for basically forever, even after Empress initially cracks it. That’s because it’ll need to be recracked everytime a dlc drops which large single players tend to have a lot off and tend to be major content updates.