I'm sorry but I might be totally out of the loop here, do gamers use Mesa? I thought proprietary drives from NVIDIA and AMD, sadly, was what most people actually used nowadays. Again to be clear I'm NOT saying it's a good thing (it's not!) just wondering what's the actual share of users relying on it.
Edit: oh, looks like Mesa is now the default for AMD "AMD promotes their Mesa drivers Radeon and RadeonSI over the deprecated AMD Catalyst" (via Wikipedia), then yes it's a big deal. Still makes me wonder what's the current share but mostly out of curiosity.