That is incredibly shitty behavior. I'm putting the disk that I purchased into my own hardware. The studio already got my money from the sale, why the hell do they care?

They care because:

for ripping

There would be no problem if you used a licensed software player to simply play back the disc. The problem is you’re trying to rip it with an illicit host key. They don’t want you ripping the disc and spreading it over the internet. You’re only allowed to play it from the original disc using a certified player.