A lot of game developer still worry about being more open with their code but it seems Terry Cavanagh (VVVVVV, Super Hexagon, Dicey Dungeons) believes it was worth it.
Read the full article here: https://www.gamingonlinux.com/2021/01/is-opening-up-your-source-code-worth-it-terry-cavanagh-thinks-it-was-for-vvvvvv