And if so, what tactics did they use? Pester the devs? Crowdfunding to buy the rights to the game from the devs? Something else?

Edit: I'm more looking for instances of the actual original game being open-sourced through fan efforts or outright purchase, like how Blender was originally open-sourced as a result of a crowdfunding campaign. The open-source rewrites of games are awesome, but I don't have the skills to build a relatively elaborate game on my own. It's also not a popular game, more niche, really, so I'm just wondering what are the possibilities.