I’m an open source developer. What does that mean to me?
I always prefer open source software. If no open source software exists to do what I’m trying to do, see the next point.
If there’s no software available to do what I’m trying to do, it’s my job to create it.
If I use open source software and find a way to improve that software, or fix a bug, it’s my job to improve it.
These statements are aspirational, not absolute. There are always exceptions and I’m not going to spend my life worrying about what piece of not free software I used today.