Apple is only trying to open up how the apps can be distributed to the phone. It’s not removing restrictions around how an app tuns on the phone. From what I guess (reading around so far) these apps might as well have it tougher because the sandbox for these could be more restrictive.

However there could be things like — e.g. TrueCaller might refuse to work without contact permission and call log etc (just like on Android; on iOS it works just fine) but when side-loaded these could demand all those permissions to run. Well that is something we may have to see how such changes pan out.