What I'm about to say is probably going to be contraversial: but I think this is (long term) a good thing for opensource/freedom. The whole idea of 'apps' on a device that sits in your pocket and has access to a whole range of personal information was from the start, a bad idea. We have seen countless cases of 'verified apps' from the Playstore which hoover up all your personal data without your consent. I believe Steve Job's original plan for the iPhone was for apps to be web-based. This is good as web browsers run all the potentially dangerous code within a sandbox, with very restricted access to the host system's resources (storage, cameras, etc). Web technology has come a long way and even allows for GPU accelerated content to be used, and it's only getting better.

Phones, by their nature, are always internet connected (obviously there are instances where that isn't the case)...so if 90% of my apps are actually just web apps then that's fine. The opensource aspect of this should be: I build and run my own infrastructure (on cloud servers or my own servers) that serves up the web apps.

Sure, this isn't something that 'normal' people would do...but they aren't side loading apps anyway.

The web is decentralised, as long as we choose it to be. We need to take advantage of this property.