[tlb]

Talk to your friends. The advantage you, as a young person, have over game studios with millions of dollars and hundreds of employees is that you and your friends are the customer for this sort of thing. So you should work on understanding what you and your friends want.

Then, you have to figure out the common ground between what you want (every game free!) and what's possible. The particular idea you mention, discounts on games for other platforms, seems like it would require deals with the game studios, which might be hard to get. But https://www.humblebundle.com/ built a good business around bundling several games together at a big discount, and there are probably more possibilities.

The tricky part about asking your friends is that they'll tell you what they think you want to hear. The only way to find out if they'd really buy something is... sell it to them for real money. Like, actually go out and buy a PS4 and XBox copy of something, and find out what they'd pay for the two together. Or try some other combinations to see what works.