That was Shareware, not DLC.

Edit: The difference being with shareware you didn’t have to pay any money to try the game. Basically the game was the demo as well as a full game, and once you played the first part of it for free, and you decided you liked it, then you paid and the rest of the game you already had was unlocked.

I think wizards of the coast will demand more products that are part of baldur’s gate 3. Tbf, baldur’s gate 1 and 2 are known for their expansions. I wouldn’t be opposed to an expansion or two.