I believe Denuvo charges for access to the activation servers. [0]
While the pricing structure has likely changed, for most game companies the long tail end [1] of the sales doesn't justify continuing.
For example, Square-Enix(Final Fantasy, Dragon Quest) removes Denuvo 6 months into a release. For a counter-example, Atlus(makers of Persona/Shin Megami Tensei) are known to never purposely remove the protection.
[0] https://www.techpowerup.com/275158/denuvo-drm-pricing-struct...
[1] https://en.wikipedia.org/wiki/Long_tail?useskin=vector