It's for security! If someone who isn't you is able to sit down at your computer, bypass your OS login, and launch the game without us asking for your game account password, they'll be able to do unspeakable damage to your game's save file! They might even finish the game for you!

You can buy the code at gamestop or if you don't care grey market 🐸

Steam does do 2 hour play time return window so that's something to consider.

But if you are buying it, buy else where.

We can all be using Amazon, Exxon, Verizon and then Pikachu face when all we get is monopolies...