Destiny 2 PC is moving to Steam on October 1

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Don't forget! Destiny 2 PC is moving to Steam on October 1. Get a head start on transferring your battle.net account over to steam.

It's a bit of an involved process, easy, but lots of checks and permissions.

Taken from their FAQ:

Which Destiny 2 purchases will transfer over from Battle.net to Steam?
The move from Battle.net to Steam will include a one-time transfer of ALL Destiny 2 content that a player already owns. These will include Player Accounts, Destiny 2, Expansions, Silver, Annual Pass, etc.

Can players pre-order Shadowkeep on Steam now and link accounts to accommodate the move later?
Yes. Players may purchase Destiny 2: Shadowkeep from Steam’s product page right now. On August 20, we’ll welcome PC players back to this page to begin the process of linking their accounts on Blizzard’s Battle.net and Steam to facilitate the transfer of content on October 1.

What will we find on Steam on October 1?
Current players of Destiny 2 on PC will be welcome to continue their adventure in Destiny 2: Shadowkeep, the next chapter in the story. New players will be able to take their first steps into that world in Destiny 2: New Light.

What happens if I don’t sign up to move my Guardians to Steam?
Unfortunately, Destiny will no longer be available on Blizzard’s Battle.net after October 1. We hope you’ll follow us to our new home to continue your journey. It just wouldn’t be the same without you.

Click here to get started:
https://www.bungie.net/7/en/PCMove