I would love to see a pervasive culture of copying proprietary games as open source projects, which we see with a lot of non-game software. Open source should be keeping old games alive and loved, instead old games are being clawed back to re-monetize.

There is some open source games, but not many and all the old console games are simple and graphically/audio simple, all the old PC games, it's really only modern AAA titles that have tons of complex assets and would be hard to 'open source clone of X'.