While the promises a shortcut to professional tools, the risk of losing your data or infecting your device is too high. To protect your creative work and your privacy, always download Soundtrap from the Google Play Store or use the official web interface.
I understand the temptation. Music software is expensive, and not everyone lives in a country where $15/month is trivial. However, using a “Soundtrap Premium APK” does not hurt a faceless corporation—it hurts the indie developers and sound designers who built those 4,000 loops and that pitch algorithm.