I look forward to this, not for potentially sketchy third party apps but for my own apps. My phone is the computer, camera, etc. that I always carry with me and I'd like to be able to write my own apps, both for experimenting and for my utility. Just sideload them, no developer program, no yearly license fees, write in languages of my choice, have a VM on my phone if I want.
If nothing else, imagine your own AI assistant that you know respects your privacy because it only communicates with your home server, or fits completely on your phone.
That would still require Apple to open the various APIs. Even though we will be able to sideload apps, it dosent necessarily grant us access to everything we need to compete with let's say Siri (not from a technical standpoint, but from an integration perspective)
> 7. The gatekeeper shall allow providers of services and providers of hardware, free of charge, effective interoperability with, and access for the purposes of interoperability to, the same hardware and software features accessed or controlled via the operating system or virtual assistant listed in the designation decision pursuant to Article 3(9) as are available to services or hardware provided by the gatekeeper. Furthermore, the gatekeeper shall allow business users and alternative providers of services provided together with, or in support of, core platform services, free of charge, effective interoperability with, and access for the purposes of interoperability to, the same operating system, hardware or software features, regardless of whether those features are part of the operating system, as are available to, or used by, that gatekeeper when providing such services.
If you have a free developer account then you need to redeploy the app to your phone every 7 days. You can only add up to 3 devices to your free account, and there's no way to remove them without paying (at least that I could see when I let my subscription lapse), so good luck if you replace your phone too many times or try to share an app with a family member or friend.
It's not impossible, and perhaps it's easy if you've already hit all the pitfalls and know where they are, but I would not describe it as easy.
If nothing else, imagine your own AI assistant that you know respects your privacy because it only communicates with your home server, or fits completely on your phone.