Beyond that, Steam and the digital media model allowed a great many people to publish games that wouldn't otherwise have been able to publish games. It made the indie world of games possible. It also did more than anyone to bridge the platform gap between windows and linux.
I can see a bean counter making a very convincing case that it's cheaper to go back to Windows and avoid all this Linux reverse engineering gubbins which isn't bringing in an immediate profit, especially when they're giving away all theirs efforts by open sourcing Proton.
He's got children to consider and could reasonably want to set them and his grandchildren up for generational wealth.