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Just did a GOG survey that focused on the idea of a paid membership option on GOG. Seems they're determining what people would be willing to pay extra for. Some of the options were
- a tool for backing up offline installers
- ability to install previous versions of a game
- extra insight into the preservation work they're doing.
- voting rights on games to bring into the preservation program.
And others that I can't remember.
I do just want to point out, Valve didn't do that - Proton is mostly just pre-existing software that they packaged together into an officially supported feature. I love that they did it, and having it in the biggest PC game platform presumably did wonders for Linux gaming, but it was most certainly not made from scratch.
I agree with you for the most part, but valve also is funding the developers behind the most important things out of proton. DXVK and vkd3d-proton were almost non-existent before Valve employed them.