Why, they'd offer consulting for a fee, of course! On such things as how to most effectively level your char, or perhaps they'd sell you a neat yet overpriced user manual that they wrote for their free software, or perhaps they'd offer printed maps for a price. :D
Jokes aside, there are loads of ways to earn money off free software, though usually you'd have to accept competition. I agree that it's probably not viable for a game, however, though there are some open source game projects out there, such as UFO:AI.[1]
Why, they'd offer consulting for a fee, of course! On such things as how to most effectively level your char, or perhaps they'd sell you a neat yet overpriced user manual that they wrote for their free software, or perhaps they'd offer printed maps for a price. :D
Jokes aside, there are loads of ways to earn money off free software, though usually you'd have to accept competition. I agree that it's probably not viable for a game, however, though there are some open source game projects out there, such as UFO:AI.[1]
[1]: https://ufoai.org/wiki/About