Nothing more disappointing to me than seeing a game I might enjoy... and then it's only available on PC on Epic Games store. Why can't it be available on Epic, Xbox game store and Steam? It's so annoying, like you have no choice but to use Epic... which I would literally do ANYTHING not to use.
GoG has been a competitor for as long as I can remember. It's not exactly a fair comparison because they mostly carry older games. But you can buy a ton of games off GoG. Itch.io exists, however it's a bit niche. Origin, humble bundle, Microsoft store. You can use all of these and get the majority of the games steam offers. Why don't people? Because steam is just better. Steam has competition. It has a ton. People don't feel that way cause EVERYONE who games on PC buys from steam. But it's not because steam has a monopoly, it's because steam offers more than their competitors, and does it better.
I don't like monopolies. I agree with you. However, a monopoly existing because they are snuffing out the competition and forcing it to be the only option for consumers is different than a monopoly that exists because consumers choose it over and over again because of their pro consumer policies.
Now because this makes it seem like I'm saying "steam is the best", there's a good bit of stuff steam has done that I don't like. But they understand what the gaming scene is and not just see the consumers as cash cows.
Gog does now have a launcher, but you can still download the offline installer files for games.
I edited that part out because as soon as I posted i did a quick fact check. Im just leaving this comment so people don't think you're crazy. You were just really fast to comment.
I am skeptical that this is the main reason (even though it's true and is a reason). I think people don't like the idea of having their games library split across multiple services, and don't like using/learning software they aren't familiar with, or that other people aren't using.
That's a possibility. You could also make a point that it's cultural at this point to use steam if you PC game. The exact reason steam is used is split across many different points. However, I stand by my statement. If games like league, valorant, osrs, or anything from blizzard can exist strongly in the pc scene, I think it heavily refutes your points. For those people at least. These are all games that don't use (or for some aren't mainly used by) the steam client.
hm that is a good point