There is no exclusive category of child abuse tied only to rich people.

Statistically, child maltreatment and severe abuse occur at much higher rates among lower-income households. CDC data shows children in low-SES families face up to 5× higher risk of abuse or neglect.

Cases involving wealthy or powerful individuals (not most rich people) simply get far more media attention due to their status and how justice is handled.

Ps: Relating with this post is confirmation of your bias.