First, child services has been called on multiple occasions and has done nothing. The police don't care either. They're disabled so they can't just leave.
They have a laptop that they can use whenever they want but their patent is extremely opposed to piracy and won't pay for my friend to buy movies or a streaming service. They watch DVDs from the library on their laptop.
They're also not tech savvy so I need a plug and play solution that will allow them to pirate media without anyone else in the household being aware of it.
Plex. If they set up a free Plex account and you setup a plex server, you can share whatevr pirated goodies you have with them. This requires an old laptop or pc (ideally dedicated to mostly just this purpose) being on all the time on your end. Anytime they visit plex they can tab over to your or whomever’s server and browse movies in a netflix type interface. A Plex server is pretty damn easy to setup, basically just download, install, and point plex to whatever folder has shows or movies. Also, Tubi, Pluto, and Plex have a surprisingly good amount of content that doesn’t require any piracy.
*if you wanna get fancy you can add a couple of apps that automate dling and adding stuff to your plex library, like sonarr for shows and radarr for movies, and then use overseerr so that your friend can request to add or automatically add things to your server without having to do any pirating themselves.
I would also recommend tailscale to make setting up the server connection easier. Just send your friend a link Tailscale gives you and she can connect her computer to yours without any port forwarding or what have you.