How is this game free?!

After playing since april and having clocked over 3k hours, recently just completed the kalymos quest and having reached mr23. THIS GAME IS INSANE!? like HOW?! not a single game that i have played in the last 6 years of my life has grasped me this well with their quests, designs, gameplay. AND THE AMOUNT OF CUSTOMIZING THATS AVAILABLE LIKE WHAT?!?!?!?!

Tldr; Thank you DE for creating this MASTERPIECE! <3