I would love it if most of this one game I played was under a free license. I also would love it if, battle.net was liberated even if its under MIT license and people can still use a non-free server. Having an option is better than no option.
PS, the game I mention which I wish was under a free license, is called Starcraft.
Sorry for a really late reply from my side: Yes, that would be outstanding. For now we have some first steps as devilutionX is available for example: Playing Diablo native under GNU/Linux is one cool thing (Link, WARNING: Github). But after all this is only the binary for the game itself while content is not free and libre, not being even available under a copyleft or permissive license. But noted: First steps coming up while I don't believe Blizzard Entertainment is giving up those content - talking about all stories and worlds from them including WarCraft, StarCraft and Diablo. That's not my personal wording as I've taken this from other discussions I've had already regarding libre gaming in the past. For people intentionally and deeply believing in capitalism as a system a copyleft or permissive license just looks like theft. A toxic smear phrase, but it is already used and just for the records the last discussion was on the forum of GOG (formerly known as: Good Old Games). Using this intentionally means people just don't think further and instead beginning with real bad insults. I was named "radical", "dreamer" and further ableism speakup I won't repeat here, but therefore my point as there is the thought "money is lost" - the obligatory toxic waste of capitalism. But long story short and better back to the topic itself!
There is more:
You know about PVPGN (sorry, again Github)? Real interesting project and working as I've played already with friends and family. And yes: You can build up your own. So you can use StarCraft under Wine for playing and connect with an own server for playing. The project devilutionX is not ready yet for connecting throughout PVPGN, but they are working on it.
At last a game is only free when code and content are released under a free license - mentioning Warzone 2100 here again as good example. There are others like OpenMW, Arx Liberatis or OpenXcom, but those are engine-replacements, a running framework needing the original and patched game-data staying therefore proprietary. So gaming itself stays one big mess: Yes, libre and free games are available but not many. Yes, there are really cool projects ongoing like FreeOrion for example, but most people don't want to have closer look as they want some kind cineastic event when "playing" - those are not longer really games from my point of view and I like therefore the classics using DOSBox, ScummVM, PCSX and Vice for example.
A a little note: There are also implementations working under GNU/Linux for Albion, WarCraft: Orcs & Humans, X-Com 1 and X-Com 2. Have a look here (again Github): https://github.com/M-HT/SR
NOTE: Wow, I've just seen M-HT also added support for Septerra Core: Legacy of the Creator into his SR-project. Well, pardon me, but I'm going to search for my CDs back then!
Human being in favor with clear principles and so also for freedom in soft- and hardware!
Certainly anyone who has the power to make you believe absurdities has the power to make you commit injustices: For a life of every being full with peace and kindness, including diversity and freedom. Capitalism is destroying our minds, the planet itself and the universe in the end!