No one also reports it because they don't see abuse as abuse, and if you're the abused kid crying out for help, the adults tell you it's not abuse and they had it much worse growing up and stop being "bad" (I have ADHD and was unmedicated my entire childhood), and threatened with worse abuse. "I'll show you abuse."

And this wasn't just my family. I know it's anecdotal, but many of my peers had this same experience and unfortunately many of them have normalized it with the same mentality of "It's not abuse. It's discipline." And "I turned out just fine." Except they didn't. But the cycle continues anyway*

Edit: for the record, I don't know anyone now who beats their kids but I do know a lot of people who are of the mindset that beating kids is healthy and should be brought back, many of these people are childless and hopefully it stays that way. If I see or hear of abuse happening, I won't hesitate to report it