You were born in an era where the internet wasn't as addictive as it is nowadays.
What specifically do you mean by 'stealing'?
> lied and deceived extensively to gain access to devices, and repeatedly sacrificed relationships and trust for more screen time
It’s not about truth, it’s about lying to gain access to devices. Lying to gain access is a type of theft therefore stealing.
As that entire structure is illegitimate, the actions of the child are understandable.