The AppGallery is Huawei's in-house version of something like Apple's App Store that the OEM has been obliged to establish after it lost access to the Google Play Store. A developer claims that it has exhibited a vulnerability that might let users circumvent the theoretical paywall in front of the premium version of apps on the market. However, Huawei allegedly did nothing about the situation for "weeks" after the report.
https://www.notebookcheck.net/Huawei-AppGallery-a-developer-s-report-of-a-bug-that-might-allow-paid-apps-to-be-downloaded-for-free-goes-unaddressed-for-weeks.621531.0.html