Because these people often don’t want to pirate. In Germany the government now fines you for piracy, using a common VPN isn’t enough anymore. Then there are other factors such as remasters and changes.

Fight Club, The Matrix, The Terminator and Star Wars are all popular films but there are several versions out there with different color grades and special effects. So I completely understand why this subset of people would want to keep their version of the movie.

I’d recommend separate computers

Usually you make your first dad joke when your kid is born. If it didn’t happen for you, you might need to go back and ask the doctor to hold you upside down and slap you on the ass.