John Carmack had some choice words when he left Meta.

"We have a ridiculous amount of people and resources, but we constantly self-sabotage and squander effort. There is no way to sugar coat this; I think our organization is operating at half the effectiveness that would make me happy.

“It has been a struggle for me. I have a voice at the highest levels here, so it feels like I should be able to move things, but I’m evidently not persuasive enough. A good fraction of the things I complain about eventually turn my way after a year or two passes and evidence piles up, but I have never been able to kill stupid things before they cause damage, or set a direction and have a team actually stick to it. I think my influence at the margins has been positive, but it has never been a prime mover.”

Imagine getting John Carmack on your project and ignoring him. Like, what was the point? Zuck got lucky in the beginning and was cut throat enough to hold on to it, but he has no entrepreneurial talent.