Don’t mention how you can get a game illegally. That’s the flag. Sorry that you weren’t aware of the DLC.
That said, it’s always been a staple of the Borderlands series. Really great, game changing/enhancing DLC. (PreSequel has the slimmest amount of DLC, but the claptrap voyage was exceptionally good)
And they work on it as soon as the base game is finished. This time the DLC seems to be all in house development (something they said on a stream implied that I think). In the past they outsourced some of it. I generally prefer their in house developed DLC.