I started 7-day trial premium. I was able to use the app with premium functions for ~1-2 hours until I reached a "gift" to open, which offered me 40% off on 1-year subscription, however I wish to use my 7-day trial and later I'd probably choose to pay monthly if it meets my expectations still when progressing further. However after this offer that popped up, my premium trial is suddenly gone! Very frustrating! No response from support either within a day.