Valve is only a monopoly because they are the best. If another storefront showed up and covered the gaps in what valve offers then they'd be able to carve out a niche for themselves like gog with drm free downloads. You can't get that on steam. The others such as epic only seem to be able to come up with anti competitive bullshit that only harms the consumer. All these fucking companies these days seem to have forgotten that they exist to serve us. Steam at least still has a great deal of momentum in that direction. They do far more for us than any of the other options IMO. It's not even close.