Downloads labeled as "zdarma" (free) from non-official sources often include:

Searching for often leads to unofficial or third-party sites that may pose security risks. Sea of Thieves is a premium game and is not officially free to download outside of specific subscription services or limited-time trials. 🏴‍☠️ Official Ways to Play for "Free"

: You will miss out on the monthly free content updates that add new mechanics and rewards.

While the full game requires a purchase, you can access it legally without paying the full upfront price: