The thing is that, contrary to the console war, we don't have to pick one over another. I'm a big user of Steam and I love it, I've been using it for 7 years now and currently have about 1000 games in my Steam library. But I also care a lot about developers, after all they are the ones that make the games we play, we should all care about them. That's why I'm happy to see the Epic Games Store taking only 12% instead of the 30% that Steam takes. That's also why I'll always pick the platform that has the lowest commission on sales when it comes to buying games, which currently is the Epic Games Store. Before that I would mostly buy games on the Humble Store.

I'm sure Steam will try to compete, I've seen predictions of commissions going as low as 5% as a result of this competition, maybe it will go that low but I doubt it. I've seen a video recently which was explaining that Steam taking 30% at the time was a really good deal for developers because once their game was on Steam, it was easily a big success. Every game coming in was carefully curated, now the doors are open to everybody resulting in some legitimately good games selling poorly.

This platform war can only be good for this market for both the developers and the consumers. It already managed to bring Journey to PC even though it was supposed to be exclusive to the PlayStation forever, who knows what will come next.