Just wanted to add that part of this may be a culture thing. Here in Germany, you are required to get your employers permission to get a second job or the like. Many of you might instinctively find this corporate BS, but in reality it's mainly worker's protection. No employee is allowed to work over 60 (I think) hours in a week. To make the companies stick to that, the government will come for them if any worker exceeds this number. Your employer has the responsibility to not let you exceed that, even across multiple jobs. That's why you have to get permission for side hustles. There are other (not so pro worker) reasons for this, but that would go too far. Suffice to say that Lütke is German and this might be some thing he brought from Germany.