I find the licensing model described in a previous blog post https://fman.io/blog/transparency/ quite interesting:

If no commit is made to fman in more than 6 months, then it will be open sourced under a BSD license.

I'd like more closed source developed software adopting this model. Perhaps there could be a service automating this type of promise, especially for software with a bus factor 1. :)

Edit: Fixed autocomplete spelling errors.