I think there are a lot of founders who don't code on their company's product anymore (though it's apparently not a pure factor of size – Gates and Zuckerberg are known for actually writing code many years in), but it'd be weird if they didn't write code at all. It would imply that writing code is never the most efficient way to accomplish a task that they want solved. Even with infinite resources at your beck and call, it's often faster to write a quick script than to explain to someone else what that script should do (and to continue to do so through whatever iterations seem appropriate).

I'm tempted to say that those who don't continue to hack were never really hackers in the first place. For a hacker, writing code is just one of the normal ways to interact with a computer.