> What you call dark patterns are ways to ensure users don't accidentally load malware onto their device. They can definitely do better though - I think a good first step would a dialog to choose trusted alternative app stores such that installing apps does not require a separate confirmation step (as is currently the case.)

Note that since Android P or so, only explicitly whitelisted apps are even allowed to ask for app install. There's a user setting for each. So this is effectively already in place.