But I know that in making that calculation, I personally couldn't give less of a shit about whether or not they released Half-Life 3, when they've been the patron saint of gaming on Linux. Which they haven't just barely saved from oblivion, but been the biggest single force in turning into an actual viable competitor.
I hope I don't need to explain why that matters for reasons that go beyond whether or not you are personally directly invested in gaming on Linux.
Their strongest recent competition (Epic) has not just been indifferent to gaming on Linux, they've actively done enormous damage to it: they've bought exclusive rights to popular mainstream games which fully supported Linux, and removed that support.
Though the picture is further complicated in that the other big competitor, GOG.com (run by CD Projekt, the Polish developers of the Witcher series), are easily the best citizens altogether, most importantly for their commitment to DRM-free distribution. But they also aren't the ones doing Proton.