I don't know. A CP can go through a child's entire childhood and never earn a penny toward supporting the child and not be at risk of losing parental rights due to being unable or unwilling to find employment.
This Dad was (mentally) ill, which may have interferred with his ability to obtain or hold a job. My parent, later in my childhood,, was terminally ill and disabled and unable to then work and provide support - and also suffered some mental health issues due to brain surgery. His brain issues, thankfully, did not interfere with his right to remain a parent. But what if he'd been a NCP with some mom who wanted to play musical daddy's? In this scenario, he could have been stripped of rights because his brain issues kept him from earning (and travelling) during the last five years.
Additionally, mom created a geographic barrier to dad seeing the child. Was mom, who created the distance, supposed to take care of transportation costs? Did she? If dad lost a series of jobs due to brain issues, perhaps he had no funds to travel out of state and see his child?
To me, this smacks of an admission fee to stay one's parent. And would tend to disproportionately affect male parents, as women get unmarried custody by default. Thus non-earner moms get to stay the parent, but non-earner dad's don't, because they are likely to be the NCP?