There're a lot more than 3 reasons, but they clearly need to be contextualized (especially for the rest of the commenters who appear to be prejudging) - BatmanDobbins put together an incredible three-hour expression of all that's wrong in the world along with a suggestion of how to fix it (which I only partially agree with, but anyway): if you haven't watched it already, I cannot recommend this warmly enough!

https://therightstuff.medium.com/why-why-everyone-is-quitting-their-job-to-play-call-of-duty-is-the-most-important-video-ever-614555f26a8a