Again, it is not wrong to make the best product. It behooves any manufacturer to sell to distributors with largest reach, especially if it is a non-exclusive agreement, and this is perfectly normal market activity. You seem unaware of the legal definition of monopoly; Valve is nowhere near it. The made up internet definition, having a majority of sales in a market, is just what happens when the product is good. Actually it would be a bit of a market failure for the best product to not have the most sales.

Also please don't point to the failure of Epic or other stores; they're just bad products. Epic store didn't even have a shopping cart for years. No one competent is competing, and that's not Valve's problem.

> If you want the audience as an indie developer, it would behoove you to launch on Steam

Correct, because they're a huge distribution channel, and literally anyone who has ever tangentially touched business knows this and accepts that it is fair to pay for this.

> (because they're a monopoly)

Factually incorrect. Nobody forces you to use Steam. You can create and launch and sell a Windows or Mac or Linux game without ever touching steam. You can self-publish and run your own game servers and CDN, or you can use the Epic Games Store, or you can use GOG, Humble Bundle, Xbox, Origin, Itch, or any of a dozen others.

> Again, MS used all these cute arguments

This is extremely dishonest. Microsoft controlled an operating system, only one of which can run at a time. If you are running Windows, you're not running Linux. And Microsoft entered into distribution deals with OEMs to pre-install Windows, leading to massive default-choice effects. Neither of these are true for Steam - you can install and run every single platform I listed above at the same time, and I've never seen a computer come pre-installed with Steam ever.

> I do think that a 30% cut for running a distribution platform is pretty predatory, especially as bandwidth has been commoditized

So, you have no idea what Steam actually does.

Steam is, in addition to being one of the largest digital distribution platforms in the US (if not the world) - which is by itself worth paying a 30% cut for, a SDK and networking provider that gives you a social network, input (gamepad/keyboard/mouse) library, achievements, digital trading cards, update system and CDN, real-time voice comms, product key redemption, license tracking, DRM, anti-cheat, user forums, and many other things.

If you only criticize things that you actually understand, you'll end up looking a lot less foolish, and undercutting your own points as a result.