the problem is, they see the market like its a brand recognition situation, which pc gamers it isnt exactly that. PC gamers are very incentive based buyers and will opt for something else if the incentive is "worth it" for them. the problem is, most platforms are really terrible at generating this incentive for consumers. GOG does with drm. free content, and to a lesser extent, epic does it with free games and tight unreal integration.

I'll give an example that wont happen because someone looking at the numbers wont let it happen. Amazon for example could easily develop a propietary media reader, and invest in a physical media printing line, and basically become the defacto publisher for physical pc releases if they wanted to, giving PC players a HUGE incentive on buying on their platform (enabling the buying, selling, and trading of used games on pc), and could easoly also be the platform that buy/sells used copies. we all just know they wont because they dont want any of the risk and cost associated on doing so.