Sort:  

So by Platform, you mean the developers of apps? How would their apps know their keys? Do they somehow embed it in the code?

Yes, yes and correct.

I see. @hatchi can you share some technical resources on how this is implemented? I am really interested in developing Steem apps, and I do not want to sound greedy, but it would be nice to get some rewards for my effort.

Thanks.

Hi @valencra I'm in the same boat, and here are the resources recommended to me by the steem team;
Condenser
SBDS
Steem
The code is all open source and free to use, and it was recommended to begin by checking out the condenser first.
Good luck!

And no I don't think you are greedy we all need to start valuing ourselves and our time appropriately.
Peace

Thanks @hatchi! :D