If I were to attribute negative motivations to it, it would probably be one more of resentment or jealousy. There are a lot of folks who are going to be growing older with no children. This often sounds great when you're young to "young", but decidedly less great as one ages. I've always wondered how society, at large, was going to deal with this.

The rise of these sort of things seems to correlate particularly well with the skyrocketing rate of single person households in the US, which increased more than 500% from 1960 to 2021 [1], even though the population in that time didn't even double.

[1] - https://www.statista.com/statistics/242022/number-of-single-...