Denuvo Anti-Tamper is anti-customer software which puts multiple restrictions on purchased products.

Major flaws of Denuvo:

• Requires constant internet connection (even for a Singleplayer games);
• If company terminates their activity / game servers - it means your game will no longer work;
• Denuvo stops games from supporting Linux or OS X;
• Collects user data without permission, nor exact information about what exactly is collected;
• Because of constant working in background, it significantly lowers PC performance;
• If any problem occurs with Steam Purchase / Game Publisher / Denuvo itself, a chain reaction may happen - locking you out from ALL your games with denuvo.
  
  
  ...and these are only few problems which Denuvo causes.
  You can read more about Denuvo for example here: https://whyisdenuvobad.github.io/
  
  Furthermore, you probably already guessed that in that case, a "Pirate" with cracked game version gets much smoother gameplay experience, while honest customer is simply - punished, with constant shutters and FPS drops.