It would be interesting to offer a curated App store with patent indemnification and malware scanning on Android. Do the whole thing, the APIs the eco-system. Without a particular vendor lock in (like amazon fire for example) you might be able to capture the Chinese OEM market which would be a lot of devices.

Very hard road to travel though.

Speaking of app stores for Android, there’s also F-Droid¹, although admittedly, it’s not much of a 'store' considering it only lists FOSS (Free and Open Source Software).

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¹ — https://f-droid.org/

Amazon have their own app store for Fire devices and Androids. It requires installing Amazon's apk though, which also requires changing a security setting.

Webapps...

Web does not and will never have the same quality of experience as a native application.

Do you use slack? Is that a "web" app or "native"? I think the lines are blurring.

It is like using all web apps in native wrapper and the telling that all web apps looks like native apps.

Slack desktop is a webapp packed in native wrapper.

I use the Slack web app, but others heavily prefer the "native" aka "fat" client. The fat client isn't much more than a wrapper for the web, but both are more than just an interface for the API, which can be a bit laggy.

What is missing in your estimation?

WebAssembly and efficient arrays bounds checks.