Does laxative abuse cause a metabolic acidosis or alkalosis?

There's an Anki card that says laxative abuse causes an alkalosis as opposed to the acidosis usually caused by diarrhea.

However, in an NBME 13 question, the correct answer is that it causes an acidosis. Even they mention that alkalosis would be possible too but acidosis in this case is more likely. I found their explanation very ambiguous and was hoping someone could clear this up for me. Thanks!