I'm not convinced by that. If DRM didn't exist then do you really think studios would be like "nah we'll just miss out on all that money".

They just want DRM because it makes them even more money. Or at least they think it does. I have yet to find a single TV show or film that isn't available on Bittorrent so I don't think the DRM is actually preventing piracy in the slightest. I guess they want it in order to prevent legal tools from easily working with videos, e.g. for backup, retransmission etc.