I think helping make OSS a thing at all, especially in the very early days when my employer was seen as the poster child for its failure, will be the closest thing I have to a legacy. And I got to travel the world teaching about and evangelizing the open source process, tooling, and ethos which was great fun. I even got to play in the big leagues for a while, at the height of our consumer successes, and those years helped solidify some important industry standards that will certainly live on for a while.
I'm happy with my contributions, and happy with the comfortable life I achieved all while having a good time doing it. I'm also very happy that I got out a couple years ago before this latest wave of destruction.