Borderlands 3 PC is releasing exclusively on the Epic Store in September

[think-man]

Borderlands 3 will release September 13 on the Epic Games Store, which will be the only place to buy it on PC until April 2020. After that six month exclusivity period, it'll release "on additional PC digital storefronts," according to a press release from 2K. 

https://www.pcgamer.com/borderlands-3-pc-is-releasing-exclusively-on-the-epic-store-in-september/

Steam can't catch a break!