It just takes an additional warning acknowledgement.
Google isn’t fully stopping sideloaded apps from using accessibility services, though. Once you’ve run into the dialog saying that accessibility services are restricted for the app in question, you can activate access under the app info screen in the top right corner via the “allow restricted settings” menu entry, so if you’re a power user interested in augmenting your phone with a legitimate app, you can still do that. This seems like a loophole that nefarious apps could circumvent by instructing users to enable restricted settings. Thus, it’s possible that Google will still change this behavior before going live with stable Android 13.
It’s also important to note that Google is only restricting sideloaded apps. If you use an alternative app distribution platform like F-Droid or the Amazon app store, you won’t run into the accessibility services restrictions, with Google probably reasoning that applications in app stores are screened, at least to a degree.
https://www.androidpolice.com/android-13-blocks-accessibility-services-sideloaded-apps/
It just takes an additional warning acknowledgement.
Thanks!