I’ve noticed a trend of people using increasingly dramatic language. Words like “abuse” and “harm” are being tossed around to describe conduct that really deserves blander words.
I’ve also noticed a kind of social feedback loop happening, where people hear these exaggerations and then come to believe they are victims of “abuse” when, really, someone was just rude.
Anyway, I don’t think reading your kid’s texts qualifies as borderline abuse. I’d reach for a word like “strict” or perhaps “overbearing”.