And yes, people do things for fun, too, not just for money.
I shouldn't do what I like because what? Because bowsamic doesn't like it?
It's not 1920. The modern middle manager has more invested in his fantasy football league than his direct reports -- and by some magnitude. Grow up.
It's also not recommended working on personal stuff with work's hardware and means, you risk losing your hobby projects to your company.
And during work time, you are supposed to work on things the company told you to do, not personal stuff. If you are planning to do extra hours for that, why should it matter where you do it?
Your comment probably seems non intuitive to many of us for all these reasons.
So, don't worry about the downvotes. They will understand someday.