It's really easy to understand. There was a game that people thought they were going to get, and then they weren't, so they got really mad and went all over the Internet writing bad things about it, even though companies buy up exclusives all the time. I'd call that entitlement. They hadn't paid for the game when it was "taken away" from them. It was still over a year from release. And even after they found out it was a timed exclusive, they still go around acting like it was this horrible horrible thing that happened to them, because they deserved to play it because they liked the first one.
Welcome to the world of business kids. You can't always get what you want. It's not shady, or immoral or unethical. I'd like to play Spiderman. Love the character, grew up with him. Insomniac makes great games. If I want to play it, I can go buy a PS4. That's how it is. I'm not mad or upset. That's how videogames have been forever. If Rise of the Tomb Raider was a true exclusive, fans could have gone out and bought a console to play it, or waited until Xbox One was cheap enough, or rented one, or borrowed one etc etc etc. Boo hoo.