That only holds if the side-project is exactly what the company does, and even then it’s debatable: if a person is interested in problem X and has personal projects around X, and the company hires them because if that, do they really expect that person to stop being interested in X on a personal level?
It’s often sufficient if the general field of work matches, though to a varying degree.
> if a person is interested in problem X and has personal projects around X, and the company hires them because if that, do they really expect that person to stop being interested in X on a personal level?
This is exactly where you start entering a problematic grey area. The employer hired and pays the employee exactly to gain access and make use of that knowledge and interest and pays a wage exactly for that. And at the same time, the employee wants to continue working on their open source project, giving away exactly that knowledge for free, which potentially diminishes the value that the employer pays for. There’s a fundamental tension here which is difficult to resolve. Open communication helps, explicitly spelling out the boundaries as well. It’s impossible to tell from the tweet which side failed here to what degree, but getting a sign-off from management in edge cases is definitely a good idea.
That only holds if the side-project is exactly what the company does, and even then it’s debatable: if a person is interested in problem X and has personal projects around X, and the company hires them because if that, do they really expect that person to stop being interested in X on a personal level?