I'm all in for the Epic Games Store.
Even tho I've never cared about having 10 storefronts installed on my PC, nowadays, I try to buy my games on the EGS if possible. Steam has lost me after a decade of numerous purchases. What once was a storefront with a terrible UI but an efficient UX, is now a purée of half-arsed features that are all convoluting the only thing I care about: Games.
Why the EGS over Steam or GOG? Well, first of all, compared exclusively to Steam, the EGS is curated beforehand. There might not be hundreds of new releases each day, but at least I'm not developing the skill I developed with Steam to become blind to thousands of shitty shovelware titles and hentai puzzle games. The UI is much cleaner. IMO, the library view looks beautifully simple on the EGS, while the last big Steam redesign made me loathe using the platform even more.
GOG, well, while I like their approach, their promise of DRM free titles is very volatile, and I wouldn't want to get comfortable with that selling point and then get f'd like some people has with certain titles. I do have around 30 titles purchased in there but, then again, it's CDPR, which I dislike a lot, GOG is one of my last options.
On the exclusivity thing, I couldn't care less. As I've said, I don't and never have had any issues by having multiple storefronts installed. I'm used to it. After all, the first thing I do after a fresh OS install, is to remove the launch-on-startup option from pretty much everything. Morally speaking, I don't care either. It's business, and more power to game devs if they get a good deal.
Then Epic as a company is one I actually like, for the most part. I was unaware of them until I started to get into gamedev and stumbling upon the Unreal Engine made me know a bunch of what they're doing to make things easier and free for game devs and artists. Ie: Mega Grants, Quixel, Godot, Artstation Learning (which I previously paid a yearly sub, and it caught me off guard when Epic acquired them and made it free for everyone).
So well, without going in further, I hope they gain some ground, but realistically speaking Steam's monopoly isn't going to get a dent in probably decades. On the Unreal and gamedev side of things, I always see a lot of hate from the Unity community, for example. One common narrative I've read is that Epic should pause the development of Unreal and other technologies or start charging the same as Unity does (a **** ton), because they have too much money, which gave them a huge advantage over everyone else and by making things free, it makes an unfair competition... I mean, am I crazy, or is this as ridiculous for everyone as it is for me?