A: 99% are fake. Some videos show remote desktop apps (disguised as Studio) or elaborate scams leading to survey fraud.
If you are determined to create a Roblox experience using only your Android device, follow this legitimate pipeline: roblox studio apk for android
Because there is no official version, the internet is rife with "APK" files hosted on third-party websites claiming to be Roblox Studio for Android. A: 99% are fake