We don't recommend using the Play Store as a first choice for obtaining apps. Aurora Store is another way to use the Play Store as a source of apps. If someone is using sandboxed Google Play in a profile, it makes sense to use the sandboxed Play Store to install apps. Aurora Store is mainly useful as a workaround for store listings enforcing Play Integrity and we do direct people to it for that.

Aurora Store still works fine. It doesn't require the default-enabled account sharing feature. It's not Aurora Store which is getting blocked but rather account sharing. Account sharing is against Google's terms of use and is now being detected more aggressively. We've warned about this for years but it took longer than expect for them to ramp up banning it. It's likely going to continue getting stricter.