Yes, but no-one does. Those stores only make sense if you have installed a de-googled AOSP, and their offering is maybe half a percent of what's on Google Play. It's an option for hackers, tinkerer and developers.
I guess it's nice the option exist, but in practice it make no difference. Most consumers are not even aware that you can sideload apps or that there's alternative app stores.
I guess it's nice the option exist, but in practice it make no difference. Most consumers are not even aware that you can sideload apps or that there's alternative app stores.