Something interesting I'd like to point out, the videogame Mindustry is open source and copyleft (I think either GPL or AGPL). You can get a build off GitHub or FlatHub completely for free. However there is a Steam version with Steam multiplayer and achievements as well which is $9.99 USD on Steam, estimated ownership is around 846.7k [1], the price hasn't always been $9.99, but assuming that isn't the case the game has made around $8 million, I haven't taken out Valve's cut and I don't know how much tax they're paying but that's pretty good. It could be a lot higher if all of the FlatHub and GitHub users paid for their copy. I initially discovered the game on FlatHub, loved it and now have it on Steam. I wouldn't have bought the game if I hadn't tried it for free.

It feels counterintuitive that freeloaders can help with sales, but consider a physical artwork like a painting. People don't tend to buy these things without seeing them first, and seeing it is experiencing, so there's very little benefit to buying it, but people do anyway to support the artist, because they want more.

[1] https://steamdb.info/app/1127400/charts/