It's obvious she is a diversity hire. She was hired strictly because it is a public facing position and she is black and female. This is exactly why she can't be fired. If they fire a black female for something as trivial as not being able to type out questions correctly she will 100% turn around and due them for discrimination. The funniest part about it is she would probably win so they will have to pay her out the ass to settle. Alexis survived the whole Ellen Pao fiasco, then they bring back spez as president, and bring in Marty as CTO. All three are white males. Meanwhile, Ellen Pao gets forced out and Victoria gets fired. This makes 808sandhotcakes untouchable. They've painted themselves into a corner and I doubt any celebrities are going to be signing up for her to run their AMA's given how badly she fucked up Murray's.
Then again, this could all be according to their plan. The celebrities wouldn't want to miss out on the massive advertising of Reddit so they will probably just have their own PR firms conduct their AMA's, which is really what Reddit wants as the PR firms would likely continue to maintain the celebrities' account to comment on threads, keeping the celebrity "involved in the community".