> [...] you could have rampant piracy, apps with illegal content or apps that siphon user data.
That's already the case today in form of the Web, yet obviously Apple is not restricting which websites a user can browse to.
In general, this whole 'third-party stores are a security risk etc.' doesn't hold any water under inspection. Security and privacy come from the sandboxed nature of apps running on iOS, and of course Apple themselves determine what APIs are available and under what circumstances an app can access what data about a device or user.
This is all independent from wherever a user installs an app.
That's already the case today in form of the Web, yet obviously Apple is not restricting which websites a user can browse to.
In general, this whole 'third-party stores are a security risk etc.' doesn't hold any water under inspection. Security and privacy come from the sandboxed nature of apps running on iOS, and of course Apple themselves determine what APIs are available and under what circumstances an app can access what data about a device or user.
This is all independent from wherever a user installs an app.