https://github.com/GloriousEggroll/ULWGL
From the github:
Gaming on the GNU/Linux operating system.
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Please be nice to other members. Anyone not being nice will be banned. Keep it fun, respectful and just be awesome to each other.
Someone else already explained the licenses, but to your second point, yes, nothing stops any other launcher from using proton, which is what all the other open source launchers do. And yes, no one “needs” this project, just like we don’t “need” any standards for anything, but it could make things a lot cleaner and easier to support.