Google Play/Apple App Store : When does an app become wifi-download-only?

Hello,

My game is in Beta via Google Play, and I noticed that my testers can’t download it unless they are on wifi. I assume that when it is already on production, users will get some sort of a warning before downloading via mobile data. I was wondering at what point (in terms of the size) does this happen?

In case you are wondering, my apk is ~27mb with a ~79mb extension.

Thanks!

Currently, on the Apple App store, it’s 100MB.