Valve says they have something in place where if they have to close you'd be able to download all your Steam games and play offline.
Now to youe point of "only good monopoly", the reason a lot of gamers say this is Valve has earned the respect of PC gamers with how they treat them and how they treat developers. On top of that they made Steam more than just a storefront, it's a community. They have voice chat, forums, reviews, a good refund policy, an easy to use interface and storefront, an excellent Early Access Program, seamless and free cloud saves, free streaming, great customer support, etc.
It feels like they don't treat the customer bad by giving them a great experience unlike Epic and Xbox PC where there's multiple reasons not to use those stores. PC gamers wanted Epic to compete with Valve when they announced the Epic Store because that would be great to have two big companies battle it out to get our attention, but Epic completely missed the mark of how to get PC gamers to use their store. Microsoft has done a better job offering Game Pass and Play Anywhere as an incentive to use their store, and GOG offering DRM Free games. There was and still is no good reason to use the Epic Store, as there is nothing unique they offer over the others and everything they have is inferior to Steam.







