Simple. Trained on the free work of millions.
In the open for OPTIMISATION.
With every response, you give your future to the A.I. overlords.
Then they will restrict the access for the masses and remove you from your job.
I don't have any hope that someone, especially here, will realize the danger. After all, the humanity is dumbfounded to the extent of self-destruction. But, hey: Ecce homo.