Big difference is that going to fast food joints isnt restrictive for anyone. I can buy a McChicken one day and buy a meatball sub the other day and nobody cares.Sure, it would be nice to get everything in one place. All the streaming services are infuriating, it was a better landscape with just netflix.
But it’s a utopian position to expect such uniformity being completely detached from the free market. What need would there be for McDonald’s if the menu was available at subways, or vice versa. Conversely such a landscape inherently ends in blandness.
While there is some leeway and overlap, begging for ports and scraps will forever be the norm.
As for your suggestion of combining forces there's a galactic gap between:
1. Sony spending 18 months with a 4 man team to port Horizon or GOW to PC, versus
2. McDonalds adjusting their 38,000 stores and Subway adjusting their 42,000 stores training new people, renovating and making their stores bigger, reinstalling kitchen gear, adjusting all their signs and tv ads to be McD/Subway combos etc...
One action involves hardly any effort and money, can cut the cord with no repercussions, and it gets sales from untapped markets. The other just serves the same people as they are everywhere already, would costs billions to do and probably take 25 years to convert all 80,000 fast food joints. And if it fails, they got to do the same thing again and convert back.