It is possible they were trying to protect Sebastian, but I would wager my savings this was more a control tactic for CP. He commented that LE complimented his ability to remove internet capability on Sebastian’s device. While Seth sees his son as being very smart, just a bit socially awkward, C & KP sounded like they were describing a 10 yr old, not a 15 yr old.Probably because autistic people are more gullible and it makes it easier for predators to groom them online. Although I can't cite cases from memory, there's a few disappearances out there where autistic kids were lured outside by "friends" they talked to on the internet.
It could also be to isolate him amidst the alleged (MOO) abuse he went through in the hands of his step-dad, I'd wager.
Edit to add that I have personal experience with being so much more gullible than most, as per my autism, specially when I was a teenager (I just didn't know I'm on the spectrum... mine was a late diagnosis).
I don’t know if he was trying to isolate Sebastian due to abuse, I don’t think he saw himself as being abusive. Remember when CPS came to their home they told Sebastian not to make up things to get CP in trouble! This according to CP.
MOO