I don't think that's a fair categorisations. I believe that is only for selling steam keys elsewhere.

Steam allows publishers to generate steam keys for their games at no cost. The publisher can then sell those keys elsewhere. The only requirement is the keys not be sold for less than the price charged on steam. ie if the publisher can sell the key on any other platform and valve gets $0.

Expecting valve to distribute your game and provide access to their steam works features for free while allowing a publisher to undercut them would be insanity.

https://partner.steamgames.com/doc/features/keys

Steam Keys are single-use, unique, alphanumeric codes that customers can activate on Steam to add a product license to their account. Steam Keys are a free service we provide to developers as a convenient tool to help you sell your game on other stores and at retail, or provide for free for beta testers or press/influencers. Steam keys are a free service, so we ask you to use good judgment and follow basic guidelines and rules around requesting and selling them.

This is completely incorrect.

The rule is that

You cannot generate Steam codes and sell them on alternative storefronts for less than you would sell them for on Steam for a similar length of time.

There is absolutely no rule saying that you cannot sell your game on alternative store fronts for less. There isn't even a rule saying that you can't sell Steam keys on alternative store fronts for less than you are currently selling them of Steam. Just not always selling Steam keys on alternative store fronts without at least sometimes selling them for that price on Steam.

The moment you subscribe, you might as well forget Apple exists.

Slight disagree on this point. Having subscriptions tracked in one place and easily cancelled with a single tap does offer simplicity and some peace of mind. Unfortunately companies sometimes do unexpected things with subscriptions.

For example, say you turn off auto-renew during a promotional period. Often companies will take you through a please-don’t-cancel workflow where you have to find the hidden confirmation button. Worse IMO is when they end the promotional period immediately if you don’t keep auto-renew enabled. Protection from stuff like that must have some value.

Wrong, Apple does not provide any additional features besides taking a cut.

I do think 30% is a lot, but this is absolutely wrong.

Steam, on the other hand, allows: cloud saves, family sharing, media library, big picture, controller support, Linux support, achievements, community, friends, groups, store with tag search, advanced review features, inventory, couch coop over internet, and fuckton of stuff.

Compare this to the APIs and features Apple provides such as iCloud storage, family sharing, media library (both photos/videos and music, separate APIs), AirPlay, controller support, Game Center achievements and leaderboards, integration with iMessage, two whole game engines to build off of, AR API that’s used even by cross platform AR apps like Pokemon Go, a ton of UI/UX tools, and tons of other stuff you need to make an app.

Latin word for apple tree, also means bad or evil. I think it should be malum (apple) instead, which also means bad or evil.

https://en.wikipedia.org/wiki/Malus

Samsung has their own ecosystem and their appstore is installed by default (power of defaults). Amazon is actually shutting down their appstore, so much for popularity.

Do you know any other app store that normal people actually install on their phone to get paid apps?

I don't believe you can say that without adequately providing evidence and financial breakdowns. Not saying you're wrong, but given that developers even in the EU where alternative app markets are allowed still publish to the apple app store, I think that it's likely more fair than you realize. The cost to do all of what they provide for a $100/yr dev license + 30% pro-bono is immense. Even the least used applications with the smallest budgets receive state of the art infrastructure, toolkits, and security review as well as a bevy of other apple provided resources. It's the same for other marketplaces as well. Steam for example provides marketing, development guidance, server hosting, and a wide variety of other non-trivial non-free to provide services for their share of the cut.