why?

The majority of the time I've seen people connected to ad-hoc wifi, they thought they were getting free internet access and didn't understand why it didn't work.

Also, as I understand it, to only plays local content and internet content - nothing from the local network.

wait, where did you read that about not playing local network content? how can it really know the difference?

Quite, there is no situation where a muggle isn't about to get pwned that involves an ad-hoc network.