> Gamers' vehement defense of what is effectively a monopoly continues to confuse me.

It is a monopoly but that can be a good thing sometimes. Steam is really good! Is it 30% cut good? Maybe not but I do think Valve has managed to keep Steam good for a very long time and if they lose their monopoly they're going to have a strong incentive to fuck things up.

Another example is WhatsApp. Sure, sucks for Google and Apple that WhatsApp have a watertight monopoly in most of Europe (and probably much of the rest of the world; I haven't checked). But it's pretty great for actually users. We've had at least a decade of totally free messaging that everyone has with no ads and e2e encryption.

Meta are just about starting to fuck it up but it's been a pretty great run.