Bad cache management

I listen to music for around 6 hours a day, in Lossless quality. In a single day it accumulates 5 GB of cache, in my storage!

Until last month I used Deezer, on the same current iPhone. I also listened to the songs in maximum audio quality. It took a whole month to accumulate 2GB of cache! And you could even clear the cache, by Deezer itself!

If I want to free up space I have to uninstall your app and reinstall. And that's not practical.

Why didn't they come up with a more optimized cache management?