Aurora Store
The Play Store is capable of injecting code into the apps that make it check if it was installed from the Play Store (this works for a lot of apps since the Play Store encourages app developers to let the Play Store handle signing the apps), and either more app developers are opting in to this behavior or Google is starting to do it more automatically. Therefore, later versions of an app can start having this injected code.
Aurora Store downloads apps from the Play Store / Google servers, so the injected versions will be installed from there too.