I've been helping friends do China phone play store install for some time, so i just share my 2 cents.
Mate 30 series will either be with or without Google certification, depending on whether USA will give Google the approval for his application.
If not, Mate 30 will announce as AOSP on Sept 19. Even if not launched as Google Android, if before shipping date US gov approves Google GMS licensing to Huawei, it will be shipped with Google.
Without installing Google Play Store, and Google Mobile services, here's how your device will interact with apps:
1) Google Apps - Gmail, Maps, - cannot install
2) 3rd party apps but use google mobile services location framework - Grab, uber, - can install but cannot work
3) 3rd party apps but not using google mobile services location framework - whatsapp, line - no problem
So most user will want to install Google play store apps and google mobile services on the Mate 30. No problem. It's actually easy as has been done by Xiaomi and other china phone guys in single app in the past - refined to perfection over the years.
For Huawei Mate 30 it's a flag ship device, so stores which carry it will presumably help you do it if you are complete computer idiot, but still any person could do it with low difficulty level.
The detail on the legal is something like this:
Have to be quite accurate here: Google licensing approval that he seeks, is merely to
1) officially certify the device for Google Android
2) to allow manufacturer of device to preload Google Play Store and apps
Devices which are certified have their Google Service Framework number stored in a certification database. There's some hash stuff going on here, because for type-approved devices, seems that there is another number which is stored.
However, for phones which are not type-approved, you can still install Google Play store, Google Mobile services and the apps, but you will need to register device's Google Services Framework number. To find the GSF number it's
https://play.google.com/store/apps/details?id=com.evozi.deviceid
and you can register here
https://www.google.com/android/uncertified/
The real contract is between Google and the End user. Hence, Google will not block end users from sideloading Play Store and Google Mobile Services, the contract between Google and End user for the apps has nothing to do with Huawei, it's the user's choice.
As long as not preload, it's nothing to do with Huawei ban. After the user purchase, user can ask anyone to help and anyone can help him without any slightest legal issue. For user to install, it's actually allowed and facilitated by Google, and end user agreement is signed anyway. It's all because Google allows sideload and because of the big amount of work Google has done to facilitate sideload, can say that it almost actively encourages.
