Many "DLC Unlocker" videos on YouTube are scams. They direct you to link shorteners (ad revenue for them), then to a "verification" survey that asks for your credit card or phone number to prove you are human.

It merely unlocks what is already on your hard drive.

, though it often requires manually downloading the actual map files and placing them in the game directory. Plutonium (BL1)

Unlockers for typically fall into two categories: "internal" cheats that unlock in-game progression and "external" tools that attempt to bypass store-front DRM to grant paid map packs for free. 🔓 In-Game Map & Item Unlockers