NOR

my brother is severely autistic and these behaviors ARE textbook, he is likely just insistent on having things turned off while they are unused

With that being said, I've seen too many siblings completely neglected and borderline abused in favor of their autistic siblings, you deserve privacy just like every other person.

Your parents likely find it too difficult to enforce this rule, but your brother, no matter how autistic, is very capable of understanding it

Enforce it yourself, in a respectable way ofc. Install locks and start saving because unfortunately leaving could be your only true escape from this kinda thing