What a ridiculous divide-and-conquer definition of “monopoly.”

Apple is one supplier out of many in the mobile device space. “iPhone users” do not constitute an industry any more than “Windows Store users.”

By your logic I could just divide every service and every industry over and over, until everything happens to be a monopoly over some small uniform subset of users.

HN is a monopoly over HN users! Nike is a monopoly over people in the Nike store! Whole Foods is a monopoly over people visiting grocery stores at this Whole Foods address! Government, please control and regulate all of these out of existence!

So now we define monopoly as only one company can sell its own products? Doesn’t that make every company a monopoly?

Depends on what you're comparing against. With the web, as much as I enjoyed those days, your take seems a bit rose-tinted. Generally, finding official binaries wasn't too bad. "This website looks official" was the bar. But that was a crazy low bar then, and even worse today. It's essentially "the domain looks correct and the design looks polished". For some of the more obscure binaries, I recall downloading from the "wrong" sites a handful of times. Rare, but it happened. When I watched my parents use a computer then, there was no check of what was legit, because why wouldn't it be legit?

Comparing against consoles like Nintendo, Sega, and Xbox back then, it was definitely an improvement. No NDAs, no exorbitant upfront costs for dev hardware, no massive take by your publisher. 30% was not much compared to all that, where it likely would have been the other way around (you get 30 [if that], "they" get 70). Today, it does feel steep, and could use another realignment, but "the good old days" weren't exactly that.