[Expo + Android] Why so many android users try subscription but cancel after 5-10 seconds?

[voidsatisfaction]

Description

I developed my app with Expo and implement IAP subscription with react-native-iap.
However, I discovered that so many 'android' users pressed start subscription button but they canceled after 5-10 seconds.
When I tested with local development environment with android's developer's account, it works fine.

Also, I discovered that many android users who successfully subscribed our plans also takes about 20 - 40 seconds to finish client-side subscription process.

Is it normal situation for android users?
Or is there anything this library's setting or sth the root cause of this situation?

I really really appreciate someone who can help this problem.

Thank you!

Environment:

• expo: 50.0.19
• react-native-iap: 12.12.2
• react-native: 0.73.6
• Platforms (iOS, Android, emulator, simulator, device): Android