It's not that hard to install an app from outside of the Play Store. It's just that people are perfectly comfortable using the most easily accessible option. In the HN bubble it's easy to overestimate how much people care about using some other app store. Developers do because it impacts the bottom line but for users to care it would have to be a pretty massive cost saving or some other obvious drawback of the official store to care about alternatives.
How often did you wonder where your car parts come from? How easy is it to mod your ECU? If there are "open source" parts for your fridge? Etc. - insert any topic that's mostly transparent only for the people who actually care about it and dive deeper into the technicalities. Chances are you care less about that but a car tinkerer feels the same way you do about your app store and wonders why you aren't protesting more.
How often did you wonder where your car parts come from? How easy is it to mod your ECU? If there are "open source" parts for your fridge? Etc. - insert any topic that's mostly transparent only for the people who actually care about it and dive deeper into the technicalities. Chances are you care less about that but a car tinkerer feels the same way you do about your app store and wonders why you aren't protesting more.