What do you think of someone who jumps jobs frequently?

I have a friend who has been jumping jobs like once every year. She has been in countless companies. The pattern is always the same: she finds a job that she thinks suit her, the applies for it, she then finds something to complain about like bad employers or bad pay, then quit and finds a new job. The cycle repeats.

I heard that you shouldn’t stay in your first job for too long because it will make employers doubt your motivation. And it will take time for someone to finally find their dream job. But is it healthy to jump jobs yearly like that?