Why would successful CEOs fail?

It is seen that very successful CEOs often fail when they move to a bigger company. No I am not a CEO and have never been. I make assumptions, big assumptions and here are some more. I think the following does not happen in a smaller organization, only big ones are infected:

Don't think everyone in your oraganization listens to you. There are a few who have their own agenda.

You are not the best anymore. You have peers who are equally good, in their own silos may be better.

Many in your organization now want you to fail. And they already have figured out where they move when you do.

You now tend to forget the smaller markets.

You are made to believe that you can't start afresh.