(This doesn't represent the current CEO or company.)
There is a lot there about the CEO's arrogance, bullying, ego, micromanagement. I've worked with early startup founders, the part that bothered me the most was his wanton cruelty.
Belittling employees or their work. Watching people leave (with families) pressuring them to stay late. Making employees cry (regularly), firing without cause and showing no emotional reaction. Calling people and their ideas dumb in front of others. Telling an engineer about an idea then declaring "if i thought of that, what am i paying you for?"
Here are a couple excerpts from glassdoor:
"-CEO is a dictator. -Fire as quickly as they hire. -Work/Life balance is a joke. -Culture is arrogant, stifling."
"One of my worst experiences ever. After someone was fired, management would send out emails to the entire company explaining why that person was let go (sometimes, for very superficial and even somewhat spurious reasons). While I'm all for keeping people in the loop, this sends a really poor message to current employees. What kind of email will be written about me when I leave or am let go? If I'm struggling with my own performance, should I expect the entire company to eventually hear about it?
It's a pretty well-known fact that Mixpanel treats their new employees terribly. I suggest anyone looking for employment at this company to keep searching or get a second opinion."
"This place is a revolving door. Every month the CEO has let someone great go.
Heartless management."
"- Horrible leadership: yes, he's young and relatively inexperienced, but the CEO also just treats people pretty badly"
It took years because the CEO owned a majority share of the company.
a few months back we had a meeting for people to ask questions after someone was fired. Didn't leave me feeling any better.