Presumably, knowing Apple, sideloading will still require your app be signed by Apple and all the fanfare that comes with it. You're now just allowed to have your own storefront and distribute your app through it.
It's not just a change in the distribution channel; the law makes that clear.
The outcome the law is aiming at is one where a developer can make and distribute an app without entering into any contractual relationship with Apple at all.
I haven’t heard anyone show that in the reporting I’ve seen.
That may have been the intention (I suspect so) but I don’t think the letter of the law made that clear. Which means it will take either an updated law or a court case to clarify that before it happens.
Because Apple is clearly not going to just roll over.
> The gatekeeper shall allow and technically enable the installation and effective use of third-party software applications or software application stores using, or interoperating with, its operating system and allow those software applications or software application stores to be accessed by means other than the relevant core platform services of that gatekeeper.
That's the user's side. Let's look at the developer's:
> [...]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.