I understand that but when I apply to a job I want an employer, not a mother. I'm still able to decide for myself what I can do and what would burn me out. And

I understand that but when I apply to a job I want an employer, not a mother. I'm still able to decide for myself what I can do and what would burn me out. And even if that becomes a problem, I wouldn't want my employer to (more or less) own me. If I'm not productive enough for my company it should just end the employment relationship (or try to help me first because that could be mutually beneficial). Also there's a large gap between "starting an open source project" and "working on your side project full-time".