AWS has tried to get into the gaming market and only succeeded in creating giant money sinks even if some of their products were technically appealing.
Oracle making anything consumer-facing, much less something that isn't a total nightmare, seems inconceivable.
Valve is able to completely outmatch competitors in a chosen field because of what they are like as a company. No shareholders that expect quarterly growth. No massive bureaucratic corporate structure, just highly skilled engineers for the most part.
More broadly, AAA gaming as a whole is also moving away from hardware exclusivity. Third-party developers (like Square-Enix) have been making recent releases for all major platforms, and even some first-party console titles are now coming to PC (eg, the Horizon games from Sony).
I'm optimistic about the future of non-locked-down gaming.