My likely oversimplified take: - Apache2 for things you're building - Apache2, MIT (permissive licenses) for things you build upon and you're going to distrib

My likely oversimplified take: - Apache2 for things you're building - Apache2, MIT (permissive licenses) for things you build upon and you're going to distribute (including all frontend) - *, ideally avoiding licenses that explicitly prohibits non-commercial, for things you're going to keep inside your walls