Nobody can because of Steam's monopoly. You can try to create your own store but you won't have nearly the same selection of games. Monopolies are bad. Even when they're companies you like. To be clear, I'm not saying Steam should be broken up, I'm not saying they should lose games to other stores. I'm saying they're a monopoly, and that is bad because it enables Steam to stagnate or even get worse.

It's also pretty inarguable imo that Steam has been getting worse. Steam sales used to be events. You'd get multiple huge discounts on AAA games. Now you're lucky to get 40% off a 6 year old game. And don't get me started on the UI, which, while fine, hasn't changed meaningfully in like a decade. There simply is no incentive for Steam to be better. So they're not. We should consider ourselves lucky that they're still as good as they are, because they won't be forever.