> It makes no sense to leave 19% of the market on the table
What's your source? Steam Hardware Survey says it's 2.68% linux and probably steam deck users.
https://store.steampowered.com/hwsurvey/Steam-Hardware-Softw...
For example, this game is on Apple Store (for Mac)⋮
https://apps.apple.com/us/app/resident-evil-village-for-mac/...
Not on Steam:
https://steamcommunity.com/app/1196590/discussions/0/3484123...
Same happens with Ubisoft titles.
But, regarding the source, here you go: https://en.wikipedia.org/wiki/Usage_share_of_operating_syste...
I do agree the way these are gathered is not perfect. But closer to reality, or would you assume Mac presence in lower than Linux?